The ultra fast SSD and instant loading surely will help make this a great feature. Seems like developers will be able to create custom tiles with a lot of functionality and have this be presented in the general PS5 OS. Think of a tile as an extension of the game (a mini app/widget merged into the OS) showing i.e. your latest position in an RPG with a screenshot, current gear and a button for jumping straight back into the action in a second. Or a Multiplayer FPS tile with a matchmaking button pre-set to "Team Deatchmatch" (your favorite mode), general stats etc. Potentially the tiles could also enable you to perform async game activities while in the PS5 OS (i.e. sending out delivery robots in Death Stranding). Hey, what about not presenting a main menu within a game at all...
Patent can be seen here: http://www.freepatentsonline.com/20200086217.pdf
Stolen from Resetera.
Sound pretty cool.