I do now that all our supermarket and dept store trolleys require coins to use them. I want my $2 back!
Pre coins, I probably did 99% of the time.
Side issue: I got glared at the other day because I'd put DD2 (she is 2 y/o) into the car, unpacked my groceries and then realised I had to take the trolley back to the trolley bay which was about 4 cars away. No way known was I getting DD2 out of the car and wrestling her back in again so I left her in the car while I took the trolley back...and I coped a glare from a couple walking by. Bet they dont have kids, cause if they did they would realise that 1) its a pain getting them in and out, and 2) she was safer in the car because she can be a bit of a runner at times..