I've switched to Picard, too. I do think for a task like this a GUI makes a big difference. I tried with beets, but you really have to do a lot of research in advance to understand what it is doing and the settings you need, and it's not one-size-fits-all.

If you don't have a lot of indie stuff, and you primarily have whole albums, AND you have the patience to go through your entire library one track at a time, then I'm sure it works fine.

The advantage of Picard is that you can see many tracks at a glance to focus on the ones that need attention. Plus you can pause at any time and pick up where you left off.

I now do almost all of this through Strawberry, which has Picard built in.