I'm also used to Spotlight. One of the reasons is because I also use KDE and krunner has the same keybinding and almost the same functionality. But I still liked Launchpad (just like the app dashboard in KDE) as it shows me visually what I have installed.

Why? Well, there are some apps I have installed and forgotten, for example, I have several 3D printer slicers, but normally I only use one. I grouped them into a folder, so I could check what I have installed if I wanted to switch for whatever reason. I also had a folder called "useless", where I place everything that I don't used but I can't remove (Apple stuff, Safari extensions, bloat installed with LaTeX, and so on).

The new "apps" can't be organized. Everything is just thrown there, only sorted alphabetically. There's no reason for me to use that, if I remember what I want I can just type in Spotlight

PS: It's possible to bring back Launchpad in Tahoe through the command line. I only didn't that yet because I don't know how safe it is to do that.