I'd say it's fair to say that 99% of D&D games take place only on the Material Plane. That is, until maybe your game makes it to a high level affair and you might check out one or two others. But what if you want to make alternate planes a regular thing for your games, even at low level? Then, you'll want Planebreaker, a new RPG supplement up on Kickstarter now.
From the campaign:
Path of the Planebreaker is a sourcebook for 5th edition players and GMs that presents you with the wonders, terrors, mysteries, and treasures of dozens and dozens of new alternate worlds—plus the inexplicable Planebreaker itself. It includes a bestiary of planar creatures and new planar class options for players to their campaigns, as well as new subclasses, feats, spells, and player character species options.
The campaign's more than 3x funded with 23 days left to go.