I have. I sat (stood) there for the Orlando game in the ECF last year when Rondo dove for the ball through Jason Williams' legs.
I might be tainted by the awesomeness of that game but I loved standing there.
First of all in the Sportsdeck there is free food and soft drinks. Really good food too. Also a bar right behind you so everything is there.
As far as standing goes it really wasnt bad at all. I prefer to stand for the games anyway to tell you the truth. I can never sit still. There are great vantage points from that section and plenty of room to stand.
Now that being said, I am not sure if your wife would be thrilled about standing for 3 hours and I definitely can see a 2 year old getting mighty fidgety. I also dont know the rules for strollers in that section. (Is she in a stroller still? Im not a parent yet!)
Hope this helps!