Balance is what's important in every aspect of life. Like the first poster said, this is the lives many women at home with the kids experience. But that's not to say that's the way it should be.
Organise a sitter at least once every two weeks for you and your wife to have some adult interaction time - dinner, a movie, a picnic, whatever gets the two of you together, without the kids. And arrange at least one morning or afternoon a week off for something that you do just for yourself - golf, a hobby, sports, the gym, whatever you need to help you feel an adult human again. You can even arrange with another parent in the same situation, that you take theirs to give them a break, then they take yours to give you time off. Double bonus - you get to talk to someone in the same situation, and the kids get to socialise with eachother.
Having a healthy and content parent is the best gift you an give your child/ren. One that is bored and stressed out isn't.