DS's teacher at school is very pro ipad and technoglogy and i agree with him and am a little in luurrve with him for this. Ds is also six - in year one.
They have one ipad session a week in class where they all play logic games either in groups, twos or alone. They are encouraged to look up homework information on ipad or pc/laptop at home (with parents supervision and help)
Ds has his own ipad and spends a lot of time on it - but not on a school night unless he's genuinely upset or anxious about something. Then I say 'ten minutes' but pretend to forget and let him stay on longer which he gets a kick out of. He gets comfort from the games and from the gamers on YouTube (stampy/iballisticsquid/amy etc)
At one point I was so worried about him using technology and getting 'addicted' to the ipad and gamers, that I called in a child psychologist attached to social services. She spent an entire afternoon with him. She said he's absolutely fine and no different from any other engaged, slightly geeky 6 year old.
Ds also LOVES the Wii - Lego Batman, lego Harry Potter, Donkey Kong, Mario, Sonic, Skylanders (he has 68 figures so far). He looks up films on Netflix on the Wii, and watches childrens stuff on iplayer. He likes 'Deadtime stories (so do I!)
He also enjoys digging in mud, squirting water pistols, playing tag, writing stories, playing with his teddies, showing his willy, farting, running, going to Beavers, dinosaurs, strawberries and myriad other things.
I am glad that he is also a whizz on the ipad, knows who is cool and who isn't, can text someone back from my phone if I'm driving. He's a 21st century kid.
AF is so Yesterday on this matter 
One last point though OP - I have deleted YouTube from his ipad as he stumbled across a pretty abhorrent site while trying to find a stampy video. He came and told me. I deleted it. He begs for it back. I have said no. He now only gets to watch the gamers on Youtube if he has done something very special and good. And then I log carefully what he watches.