i was a bit of a crusty in my day, levs fine by me
size is critical for me, too small and the atmosphere just isn't there - and when you're in charge of kids and not free to make your own entertainment in that way then what other people around you are up to matters more, iykwim. big green is indeed big now, and rambling over a huge site, love it.
ideally you'd go as a big gang of you so you can alternate babysitting duties for kid-free time. tbh i treat it as camping with entertainment, i have the odd drink but nothing more indulgent than that. that's another reason big green is good, because there's no big headline bands that you have to walk out of half way through cos the kids are wailing, don't feel you're missing out quite so much.
when we did end of the road my favourite band were playing and it was only the second time i'd had the chance to see them so dp took both kids for the evening so i could go off have a drink and a proper dance, it was fantastic, one of the best gigs i've been to and all the sweeter cos it was stolen time.
i reckon by taking them from a young age you get them reasonably well trained, and everything gets more relaxed as they get older (and once you stop breast feeding!). and of course when they're a bit older you can leave them wit the grandparents and do a festival proper