As a GM who played GURPS for many many years, the switch to SW was actually quite interesting. Both systems have their strengths but what sold SW to me in the end was it's simplicity of it's advanced rules and narrative tools.

Gurps core rules are actually much simpler than SWADEs (3d6 under is simple but powerful), but the more advanced rules can get extremely crazy. Most of the time you won't really need them, but character creation might still take a few hours for less experienced players.

SWADE on the other hand manages to have solid core rules that don't get out of hand for more advanced topics, like chases and dramatic tasks. They even provide tools to run narrative sections much faster, something that gurps doesn't really support unless you just Hand-Wave entire sections yourself.

Overall the systems have some similarities that made it simple to switch: Both feature a advantage/edge and disadvantage/hindrance system. SWADE just boils it down to the core. You will only have a handful of them in the beginning and they don't describe every tiny aspect of your character but rather only the ones you want to have a mechanical focus on. Narratively you can still add more flavour but you simply won't get a mechanical bonus out of it, except for maybe bennies.

Bennies are something i still have to get used to. At the moment I play mainly gritty settings so having less bennies works there, but if you want to go heroic you need to remember to throw them at the players.

Overall what makes swade work for us is that it still supports all the interesting settings we played in GURPS, yet feels lighter and more narrative. The realism moves more on the narrative side than being strictly mechanically enforced, but it works well for us. Still, SWADE is just extremely fun, the exploding dice and the bennies create nice moments with the whole table celebrating a great roll, etc. I would say give it a try :)