When people who are going to Uni for the first time ask me to compare rides to WDW, i always use these two rides. MiB is TSMM or Buzz but way better, and Mummy is Rock n Roller coaster x 100. Simplistic, sure, but the message seems to resonate.
i hope these two stay around for a long time; they're two of our favorites (even though i can't seem to crack 300,000 on MiB!).