Back to the topic at hand...
How ought a man love his wife as Christ loved the church?
How ought a man love his wife as he loves his own body?
It is important to realize that love is an action, not a feeling. This is especially true for agape love. When the scriptures command men to love their wives, it is a call to action.
Now when we think about love we often think about eros. This is lust or romantic love. This is largely, though maybe not entirely, a feeling. This is what our society thinks of when they talk about marriage. Instead of basing relationships on commitments or authority we base them on eros. And this is one of the biggest causes of divorce today. Once that lust inevitably fades, so does the foundation for the marriage. Hence people pointing to as the reason for divorce: boredom, growing apart, irreconcilable differences, seeking outside romance after the honeymoon phase is over and the like.
And this is how we get statements like the "I love you but I'm not in love with you" too often given by women on the way out the door. You're family, but you don't turn her on anymore so see ya.
Viewing love as a feeling also leads to several other problems:
First, it set's the woman up as judge, arbiter and master in the relationship. She can say, "I don't feel loved" and so direct the man's actions. Not only does this invert the authority in the marriage, it injects a large amount of chaos as the man's actions become governed by the changing whims of her emotions. A very common example of this is the Love Languages book and how every woman seems to have service as her love language. Every time I've seen that book taught in Christian contexts it's only effect was to make men more comfortable with being in submission to their wives.
The second problem is just as grave: love doesn't always feel good. Love sometimes means you have to do things or make decisions that she will hate, that don't feel good, that are difficult, unpleasant, or objectionable. Sometimes the easy feel good path leads only to destruction, and that is not loving. An example of this would be dealing with a wife's out of control spending or out of control eating. Love of money and gluttony are sins. Dealing with these will not be easy or pleasant and there is great risk of pushback and hurt feelings. But there is nothing loving about the results of obesity or consumerism.
A third problem is viewing love as a feeling gives excuse to avoid action. "I don't feel love for you, therefore I needn't do x.". Love is an action. Sure feeling is part of that. But not feeling it isn't excuse to avoid the action. If you don't have the feeling, the action is a good first step. Start with the action, feeling will follow. [the same goes for submission, but that's another topic]
A fourth problem is inaction. You can't use your feelings for your wife as excuse for inaction. You can't say your love your wife while you simultaneously fail to provide, protect, lead and teach. There is more to marriage than sex. How many men really act as the spiritual leader of their home? Do you teach your wife and children the scriptures? Do you set a good example of holiness, righteousness and service to Christ? Or have you abandoned those responsibilities, leaving it to the insufficient or negative influences of the schools, the culture, or the church? Do you live a life distracted by the cares of the world rather than on mission for God? People don't care what you say, only what you do. It is by our actions that we most strongly teach our family.
There is a parallel to this last one in James:
But someone may well say, "You have faith and I have works; show me your faith without the works, and I will show you my faith by my works."
And that's no coincidence, for as Christ said:
If you love Me, you will keep My commandments.
and
He who has My commandments and keeps them is the one who loves Me; and he who loves Me will be loved by My Father, and I will love him and will disclose Myself to him.
Love is an action.