Well, yeah, exactly!
Pro's of GM - it's "hack-y". You click "NewSprite", you upload you image sequence. You click "NewObject", you pick your new animation from the list, - and you place your brand new wall, or tree, or fire, in the game. It's done. You can build your whole level in several minutes, it's very intuitive and very straight.
No need to struggle with collections, organize your files or dig through settings. Just bring your stuff and place it on screen.
Cons of GM - it's not really suitable for organized and long work. Sooner or later lack of organisation can (and will) bring snowballing mess.
So, from my point of view - that's a struggle to get used to new tools and order, but that's a good thing. Personally, that's what I was looking for.