I love the Colle. Just because you start off in that opening that does not mean you stay with it. The option to get out of the book during the game is always present.
The option to attack the King side is my favorite reason. But the the heat on your opponent early. Diagonal lines to play as they can close one but another is open. If they manage to do that then open up files and the whole thing opens up much more than they wanted in the game.
Who likes the Colle System? Tell me why, post games with annotations if possible.