As others have noted, it's hard to put in words how much you love someone, especially when that person is your spouse. Luckily, when someone is your wife, they never leave (!!!, just kidding), meaning you get a lot of time to tell them how special they are.
When I first met you I quickly found a great friend, someone who was fun to study with, easy to talk to, who liked the same music, cooked great food. I don't know why it took me four months to realize you were something special and that I should ask you out, but I'm glad I did. The past 4+ years together have been amazing, and the last 2+ of being married have been the best by far.
Here are some of the things I've really enjoyed about you. You are a great listener, and you have really worked to get to know what is important to me; you keep all my friends straight and remember most of the stories I tell you about them. You have a great sense of humor; although I don't think some of your stunts are as funny as you do, I am happy that we can laugh together so much (part of staying healthy for sure). You are a great aunt to Caleb, Dominic, & Evey; you make your own gifts for them, love playing with them, take pride in their accomplishments. You're very talented professionally; you have worked in some very tough jobs, dealing with all kinds of frustrations, but have managed to keep a good perspective on it all (not to mention that you've brought home the bacon - or fakin' bacon as the case may be - for us the past 2 years. I promise to contribute one of these days).
I love you tons, dude. Thanks for being my motivation to always do well in life. Thanks for getting the ball rolling on getting fit, for preparing good food, for keeping our lives healthy in so many ways. There's plenty more I could say to tell you I love you, but I'll let some of the others have a turn.