I tend to be strategic - hitting the E-ticket rides that will fill up quickly. Of course I'll be opportunistic and hit them again (and again) when it's easy later on. But I like to guarantee I'll get on at least once, and likely a relatively empty ride.
That said, in MK I hit PotC, TMRR, HM, SM and JC first because they're my favorites. In EC I'll hit SSE, TT, Soarin' and MS for the same reasons. HS gets RRC and ToT. AK is the KS and EE.