I'd say that everyone HEs their preschoolers - or everyone should (sadly there are kids who start school with no idea what a book is or how to hold a pencil) so getting at the OP for using that term is a bit mean. Education doesn't start at legal school age.
But - you asked in a forum for people who are educating school age kids. Perhaps not surprising they were a bit 
Some two year olds do like more structured learning. Mine was obsessed with flash cards well before that - not because I was hothousing him, but because he'd seen his older sister's. Did I "teach him to read"? No, but I read with him on my lap and pointed at the words, and left gaps for him to say the ones he knew (since he'd memorised the story) while pointing at the next one. We went to the library every week and he chose books. We talked about "a for apple" and pointed out words in everyday life. Normal stuff, not special planned lessons.
When he was two and a half I caught him sat on the kitchen floor with magnetic letters going "c a t cat, b a t bat." He was reading silently long before he started school (he's an August baby, so that was at four and a week).
And no, he's not a frigging genius. He's bright, but not in top sets at his school (where some of the kids really are frigging geniuses). He's a similar level of bright to his sister who wasn't anything like as precociously early at reading (they are now 18 and 15). And the absolute best thing I did for him at preschool age, IMO, was to send him to the local playgroup with no track record of structured learning at all, where he learned to have fun with other kids his age playing with sand and cars and paint, and to sit on the carpet at circle time.
Honestly, let your child be his age. Don't push him into classes with kids masses older than him just because he can just about cope, no matter how tempting it is and how special it makes him look. It isn't a race and he is much better off learning to be one of a group his age than the special one only interacting with older kids.