We have been at WDW during gaydays twice...once when DS had just turned 7 and last year when he'd just turned 13...there wasn't anything going on that we saw any differently than we'd see back home. DS never noticed anything or if he did he didn't verbalize it to us on either trip...there was no having to have the "talk" right there at WDW. Besides, he and I had that talk about a year before...he has an uncle, who's gay, that he has not seen since he was a baby and he was curious why the uncle had never been back to visit his grandparents in almost 15 years...the grandparents (my ex in-laws) are still either living under a big rock, in denial or just plain stupid...he's a great guy, but I understand why he choses not to return here...there isn't anything for him anymore and it's sad that his own family acts the way they do.
The only thing you might consider is the crowd...when any large group heads to a park it makes a difference...last year we just chose to avoid MK during the day that weekend...would have avoided it anyway on the weekend because of the usual crowds then...but we went that Saturday evening after dinner and stayed the rest of the night...it was pretty empty and we walked onto many rides.
There are many factors that would influence your decision to go or not at this time, but it all boils down to you, your family, and what you want to do and I suppose your comfort level. For us, the first trip we didn't have a clue until 2 days before we left...still not a factor for us. When we planned the trip for last year, we knew exactly when we were going and again...not a factor for us. I didn't feel that we observed anything other than individuals, couples, and families who were at WDW to have a great time at the most magical place on earth.
If you do a search on the theme park planning board, you'll find several threads on this topic with a mulitude of opinions. There is a new Gay and Lesbian board here at the DIS...might find some answers there. Also, there are 2 websites for gaydays that have the schedule of events...one is the more official site while the other isn't...I can't remember which is which...but one is gaydays.com and the other is gayday.com...just can't remember which is which...sorry. I found it really interesting and very informative.
Well, I don't know if any of this was really helpful...I hope it was a little...like I said...do the search on the theme park planning board and you should find lots of threads on it...some unfortunately that turned pretty mean and ugly.
Whenever you decide to go...I hope you have a wonderful trip!