
The problem with the whole thing is that you're assuming a marriage is at it's best during a period of time when your love is largely about emotions and obsession (and no, I'm not saying that this is always the case for every couple). If that's the case, I highly recommend not getting married. There is obviously an emotional component to love, but love is an action and a choice, not a feeling alone. Marriage is a covenant, a promise to love each other through all the trials of life until the end of life. You can't make that promise with any hope of keeping it if you think love is strongest at the beginning. You can only make that promise if you have decided to actively love your spouse regardless of how you feel about them and what you're going through. This may not sound romantic, but it's really the key to a true, lasting romance. When you've committed to each other like that, you can have a truly happy marriage. Those warm, gushy feelings should be an outcome of your faithful love towards each other, not the foundation of it.
All of this to say, those first couple of years are fun and exciting and special and you'll never get them back. But they are not the best. Marriage just gets better. Every day that you live life together, every day that you wake up and make the decision to treat your spouse with love and respect, every day that you get to know your spouse better makes your marriage better. I do not mean that every day will be happy or that you'll always like your spouse. It's far more likely that you will have days or even weeks or years where your marriage struggles and is even miserable for a time. When that happens you can get out and jump into another relationship that will be happy for a time before also falling apart. Or you can stick it out and keep your covenant. Interestingly enough, Tim Keller noted in his book, the Meaning of Marriage, that most couples who are unhappy right now but stick it out, are happy within five years and go on to have happy marriages.
On a similar note, when we were planning to have a child and while I was pregnant and after I had Izzy, a number of people made comments about life being over after having a kid. Life is definitely different and will never be the same, but it is so much better.
