This is a gaming forum so the likelihood of multiplatform gamers is gonna be high here.
I don't think its the norm to play on multiple consoles per se, most people I know just game one console. But multi console gamers are pretty common, especially if they play a Nintendo device because they need a PC, PlayStation, or Xbox for core games.
I personally try to buy all the consoles just to have access to more exclusives. I often find the efforts of 1st party studios more ambitious and fun. Xbox One X is my primary gaming device though.
As far as making time for all these games, I tend to just spend my time playing campaigns so most games I play are about 6-15 hours. I also tend to focus on campaigns when playing open world games as the side stuff tends to just be a time sink. Many games have also left my backlog or I will stop playing if I'm not enjoying them so I can focus on games I consider more worthy of my time.
On a side note, buying all the consoles is not that expensive when you wait for deals. I waited years to buy a PS4 so the price would go down and it would have a good library of exclusives. I don't buy many games at full price either. There is always stuff in my backlog and I'm buying less games at launch now that I have Xbox Gamepass.
Wolfenstein: The Old Blood for X1 (3/5) - Assassin's Creed: Origins for X1 (3/5) - Uncharted: Lost Legacy for PS4 (4/5) - EA UFC 3 for X1 (4/5) - Doom for X1 (4/5) - Titanfall 2 for X1 (4/5) - Super Mario 3D World for Wii U (4/5) - South Park: The Stick of Truth for X1 BC (4/5) - Call of Duty: WWII for X1 (4/5) -Wolfenstein II for X1 - (4/5) - Dead or Alive: Dimensions for 3DS (4/5) - Marvel vs Capcom: Infinite for X1 (3/5) - Halo Wars 2 for X1/PC (4/5) - Halo Wars: DE for X1 (4/5) - Tekken 7 for X1 (4/5) - Injustice 2 for X1 (4/5) - Yakuza 5 for PS3 (3/5) - Battlefield 1 (Campaign) for X1 (3/5) - Assassin's Creed: Syndicate for X1 (4/5) - Call of Duty: Infinite Warfare for X1 (4/5) - Call of Duty: MW Remastered for X1 (4/5) - Donkey Kong Country Returns for 3DS (4/5) - Forza Horizon 3 for X1 (5/5)