There are two groups of folks you'll see on Pinnacle:
Out-of-towner/tourists
Locals with big lips/tits/egos
Regardless of which group the hikers fall into, everyone is very considerate and willing to move out of the way for those who are truckin' along faster than they are.
As others have suggested, it is NOT a loop trail, so it's a up/down/up/down and repeat kind of hike. There are two mid-hike seating areas with look-outs and distances to the other area mountains - pretty cool.
Beautiful views, but that's to be expected!
Parking: park on the street. Don't even bother trying the parking lot, as there are always several cars stalking for spots. (Which BTW, I will never understand why someone who is about to HIKE A MOUNTAIN will wait 10-20 minutes for a parking spot to save a few steps...!?)
The only minus are those parents who bring their very young kids along and don't supervise them as they dart in-between people (or alternatively, the parents yell at them when they say they're tired/have to pee - stupid parents).