We never did until we had our child, now we definately do.
If I can make a suggestion, take your time. Let me provide an example:
My cousin just visited WDW for the first time in years for a week. They went every single day, from opening until close, without any days off. Now, they did occassionally go to the pool to get a rest, but really they never stopped in the parks and took the time to really get the "feel" of the "magic".
I went at the same time with my family, we slept in, went in later, stayed late, took our time, walked leisurely, watched shows/parades.
In that time span, their child was just too exhausted to enjoy it all while mine was always leaving the park with a smile on his face.
I cant stress enough the importance of taking your time to take it all in and not "overdoing it".