Yep, that's what I saw in Japan recently too (both electric and non-electric). Tons of bikes had a child seat, some of them had 2 child seats.

I also loved how (as you can see in this photo), people just park their bike the way you park a car: you just leave it there, without locking it to something. Here in America bikes like that would be stolen left and right. But I guess that's one of the big differences between a highly industrialized and developed nation and a 3rd-world one.