Cloud saves that work reliably and games that support the steam workshop instead of 3rd party mod managers makes a huge difference to me. The reality of putting down a game on my desktop and then starting it up again in the same state on my laptop later that night without me having to do or think about anything across basically every game in their store is amazing. I can spend hours crafting my perfect Dwarf Fortress or RimWorld mod setup and it's just saved and available on every computer I play on.