I stopped using our dryer almost completely over the last Hydro billing cycle to see how much of a difference that made. It made a HUGE difference! I knew it would affect SOMETHING being as we do a ton of laundry as a family of 7 with 3 in cloth dipes (plus we use cloth instead of paper towels). But the difference was way more than I was expecting!
Our bill that came today is $168, down from $252 last billing cycle! Even when it's raining - I've been moving the racks inside the house to dry clothes and outside when it's sunny they dry about as fast as our dryer.
It's been warm enough that we didn't have to have the heat on either billing period - so that's not a factor - it seems to be just the dryer usage that makes the difference!