No I wasn't a big fan of the busy beaches either. The resorts were fine, but the island itself wasn't as amazing compared to all the other ones.
I also went at a time when the weather was not ideal so that probably didn't play in its favour.

Thanks for the tips on Ao Sane. I'll keep that in mind for myself and others who often ask for tips on Thailand. I must admit Phuket is usually just a transit town for me.