Generally, we don't put on the heater after it goes off for the season. I don't remember when I switched our boiler over to water only, but it was a while ago. Maybe March? We had very nice weather in April, so I don't think it was on at all then. I was tempted the past week to pop it on a couple of times, but it was less about comfort and more about wanting to have more heat to dry my clothing faster.
I do the tea/blanket/HWB thing before turning it on, but I do it more for our electronics than anything. Once it's winter, and it is more regularly on, I turn it on on a schedule: usually a few hours in evening and in the coldest periods, an hour or two during the day. For some reason, the boiler seems to mess up if we set the timer.
We're trying to save on the gas bill, but we're also trying to be green. I have to admit as prices go up, saving money is more the drive than the environment.