Here are some of mine
MK
Share A Dream Come True (starts in Frontierland ends on Main Street USA) Outside Peco's Bill's
Spectromagic (starts Main Street USA ends Frontierland)
Underneath Train Station, by Firhouse (both on M.S. USA or outside Hall of Presidents in Liberty Square)
Wishes Bridge to Tomorrowland, bridge to Cosmic Rays, on top of train Station (you have to get there like 2 hours early though!), Mainstreet USA up by the hub
MGM
Stars and Motorcars (starts by Star Tours ends at Park entrance (Hollywood Blvd) inbetween Sounds Dangerous and The Hat.
Fantasmic (get here early and bring something to keep the kids busy!)
midway down the middle section or the witch section.
Epcot
Illuminations outside Mexico, bridge from UK to France (almost anywhere becuase it is in the round.) Just make sure you are clear of trees (otherwise you will miss some of the fireworks) and can see the globe.