Is there a popular footprint for right angle SMT LEDs?
No.  And I would say 0805 and 0603 are not especially popular either.   On Digikey they have 2,491 right angle indicator LEDs 24 are 0805 and 19 are 0603.  And that include duplicates  of reels, DigiTape, and cut tape.  

If you really want to know which is most popular go to digikey and click on each "package / case" and see how many are remaining.  

LINK: Digikey Right Angle Indicator LED