The keybinds you can set up in e.g Ranger for navigating or moving files are incredibly fast and easy. Sure you could just use shell commands/aliases etc. but the visual representation of the file system that a TUI provides, I find really useful.
Openboard with swipe is the current champ 💪
maybe look into udiskie for automounting/unmounting your external drives. It notifies, ejects and powers them off nicely with a terminal command you could alias, script or keybind to something real simple. Then in ranger I have ‘gm’ set as shortcut to go to media. I don’t need the GUI file manager that often anymore.
After some time living with Gimp/Krita etc. you will learn to do the things you did with Photoshop. It does takes some time and research/learning. I was real comfy with PS and do miss it but the more I’ve gone without, the more I’ve found ways to tackle the things I need to do with alternatives.
Use it everyday and you just pick things up over time, you don’t need to know everything. Make your terminal pretty colours. Fetishize about keyboards and the simplicity of plain text.
Very comfortable with Rofi. It’s especially nice in a window manager as it also works as a switcher or shortcut to your open programs.