Theres two ride dispatches I love too - they just seem really cool and well sorta 'themed'.
One of which is Air - its great how the floor lowers away as the station turns blue, theres a little gust of air from the floor lowering and the voices say 'Prepare for Air...' as the seats tilt up and face you down... and then 'Now fllllyyyyy' as the trains roll out.
Its just kinda... cool. Thats what I like lol. It kind of adds to the usually somewhat boring dispatch of a ride.
I also love Nemesis Inferno as sooooo many people know I say lol. Again, the floor drops away, the station turns red, and those fantastic bass canons in the roof pound out a thumping heartbeat with the fantastic xylophone theme tune that sticks in your mind, all just adds to the tension and build up of the ride.
I love watching both of them in the station waiting to ride - although I have to say I'm really disappointed that Nemesis Inferno seems to have dropped the dispatch music and turned down the bass canons - even with the new weird music playing the canons are still there though very faintly! Good news was that they were playing the N:I xylophone style theme tune thing in the queue and area though, instead of the jungle noises!
On that subject... the somewhat quite good dispatch music has gone from Colossus too... no more 'Colossus... the power of 10'... just a guy telling you sit back, hold tight and shut up or something ;)