I love this airport because I love Vegas! Hahahaha
BUT, with that said, this can be one of the busiest airports I've been to, and it's mostly because I come in on the weekends, when everyone else is pretty much coming and going to vegas.
But as far as the airport design is concerned, you have to take a tram from certain terminals, depending on your flight...I believe AA, US Airways(now american), and Southwest are definites for tramming it to baggage, but not sure which other airlines.
ARRIVING - be prepared to get into a long line for taxi service. The line moves incredibly fast as the taxi cab system setup here is second-to-none as far as efficiency is concerned, but the line IS long.
DEPARTING - arrive early, a TON of flights take off around the same time, so security lines can get quite long, but once you're past security, it's pretty much smooth sailing.
PARKING - short-term parking if you're picking up a friend is easy and convenient.
CAB RIDES - it's cheaper to take side streets to the strip by about $6 or $7, just emphasize that you wanna take local streets and not the freeway, which can end up costing you about $25