I loved flying the 150 and PA-28 x-c and got together with friends at least once a week to go somewhere, anywhere. Also made quite a few solo x-c flights just to see the country. I'm not sure why but one day a few months ago I thought it would be fun to take an intro ride in an R22. I've flown just a few hours fixed wing since, and am about to take my checkride for the helicopter add-on rating. Like the others said, it is expensive. But worth every dime. I suspect that the whirly girls will second that.
The only advice I can offer is to find an instructor you're comfortable with. You'll know pretty quickly if he/she isn't right for you and don't be shy about changing.
Don't think about the amount of money you're spending while training. It's an obscene amount, but worth every dime.