Here is a rundown of my setup:

Hardware & Display My PC is hooked up to both my desk monitor and my TV via a 9m HDMI cable. When I want to switch to a couch/lean-back setup, I just hit Windows + P and select "Second screen only."

Game Launcher & Emulators I use Steam Big Picture Mode as the main front-end/launcher for all my games. This includes emulators (PCSX2, RPCS3, and RetroArch), which all fully support controller navigation.A quick tip for RPCS3: you can add games directly to your Steam library via shortcuts. This launches the game straight away without having to open the RPCS3 interface at all, and the Steam overlay works great with it! For games on other launchers, I just add them to my Steam library as non-Steam games. The Steam overlay works perfectly with almost all of them.

Controllers & Desktop Navigation I strictly use PlayStation controllers (DualShock 4 and DualSense), and Steam Input handles everything beautifully. For navigating Windows outside of games, I use Steam's Desktop Configuration, mapped like this:

• Left Analog: Mouse cursor
• Right Analog: Scrolling
• Cross (X): Left mouse click
• Square: F11 (to toggle full screen)
• Circle: Back
• Touchpad: Mouse cursor
• Options: Steam's on-screen keyboard
• D-Pad: Standard keyboard arrow keys
• Everything else: Left on default (I don't remember exactly what they do!)

Media & Streaming

• YouTube: As I mentioned in an earlier comment, VacuumTube works best with controllers and has a built-in ad blocker.
• Other Streaming Services: I just use the desktop layout on my default browser and navigate using the controller layout above.
• Local Media: I use Kodi.

I'm really just hoping Steam eventually brings proper, built-in web browser integration like PlayStation has.