Gnome is a harmless though. It's so benign it's reliable.
KDE is glossy and featureful and sometimes my CPU fan doesn't go down for whole hours because baloo is scanning my entire filesystem (including various conda installations) despite me repeatedly asking it not to.
Baloo only takes up a lot of CPU if you have it set to index file contents and hidden files. Shut those off, let it index completely, and it won't happen ever again.
You might be able to keep "hidden files" on, but indexing file contents always bogged my laptop down.
I think it depends on how you use the OS, Gnome is great until you have a bunch of outdated extensions that break stuff. My impression is that KDE is better for the "advanced" use case and gnome is better for the "default". I tried gnome recently and I found it very pleasant and easy to use but I prefer KDE since it has more customization.