Why would it be held back? Its an excellent OS.
I've been a mac user for about 15 years but still use a windows laptop for work. I used to support windows many many moons back and hated it but don't mind it now (although am still using 7, not keen on the parents 8).
I do think Apple's days of 'it just works' went a long time ago. It works how they want it to although in fairness that is more suited to phones/ipads.
Anyway, enjoy your new transition. It usually takes people a while to get used to them but sounds like you're fine. I love my macbook air, think its the best unit out there