Helen, I'd be interested to know what you thought about your own question.
Growing up, I hated doing my treatments (granted, I still do sometimes), but my parents made me. I am so glad they did!
Not doing treatments is sooo tricky. It makes you feel free and normal to not do them, and you may think it isn't doing any harm because you don't feel any different. Keep in mind, however, that the mucus in your lungs is not just going to disappear.
Should a cure or treatment breakthrough happen in your lifetime, be aware that even the best cure can not reverse damage already done to your lungs.
I don't think bad of anyone not doing their treatments, but it does make me sad, cause I know one day they will be regretting it.
--Wallflower, 34 with cf, working full-time and saving for retirement!