I was on a decade-and-a-half gaming hiatus (job, kids, the usual) until we got the Nintendo Switch early in the pandemic (and it was a saviour for the whole family). When the Steam Deck was announced, I hesitated a day or two (this probably pushed me three to four months in the delivery queue), but eventually realized that this is the device I've been waiting for my whole life (a Linux-based gaming hand held which can also be used as a general purpose computer) and ordered it. I had a dormant Steam account with only Civilization V in it (my wife got it for me on DVD when it came out, and that's when I made the account). Since then, I bought >200 games and >100 DLCs (I started playing some of the lighter ones on my under-powered Linux laptop before the Deck arrived and continued on the Deck using cloud saves), finished multiple games, and felt sleep depraved for months.
Currently, me and my wife are playing Divinity 2 in split screen mode on the big TV. I also use the Deck for online courses, responding to emails, writing documents, surfing, etc. I created a desktop controls binding for handheld desktop mode usage which allows me to change zoom and brightness, bring up the keyboard easily, copy and paste, open the start menu, alt-tab between windows and go in and out of full screen mode etc. all with one or two motions of the controls. For example, I mapped swiping up and down on the left touchpad to mouse wheel up and down, and swiping left and right on it to SHIFT+mouse wheel up and down, allowing me to scroll in all directions using my left thumb. This allows me to use it for reading illustrated books where I need to zoom in and out and scroll across the page.
Steam Deck is a game changer in so many ways.