Is this what you are doing for mass tagging or when you are trying to fill playlists?
If you are asking me, I am just accidentally holding my mouse button down and moving it. I am not trying to do anything. But if you let go in the column browser it retags to whatever you dropped it on. It does have a popup, but its very easy to accidentally click yes. And example of why this scares me is I could accidentally drag all of artist#1 to artist#2, and now artist#1 is tagged artist#2 instead.
I also earlier accidentally dragged an artist to one of their albums. This changed every song by that artist (which had about 20 albums) to now all say they were from the same album....
As for pet peeves, mine has to be how easy to alter a tag when clicking a song in the main window. I remember a setting that disabled in-line tag editing when clicking a track in the main window, but for the life of me I can't find it in v3.1 despite having disabled it under v3.0.
I noticed this as well and have accidentally double clicked on a few things. I would also like to turn this off if possible. I am not as worried about this at the moment though as one tag getting messed up isn't as bad as my fear of messing up my entire library with one click.
It's part of the learning curve. You admit that it's your own fault, dragging, dropping, clicking too fast without reading. Slow down and learn to do it correctly and patiently.
Okay, well I still feel like it is a serious issue that a program which promotes itself as something that can manage large libraries has the ability to easily mess up hundreds of tags with a single mis-click.
Also, I really don't think this is something that can be considered a learning curve. I have always had trouble with being... Nervous? Twitchy? Anxiety in general? (I don't really know how to word that.) If it can be mis-clicked, or even knocked over in real life, I will do it. I kind of panic before mentally reacting to things. If I could easily just slow down and learn like you said I would have years ago.
Either way, I don't really think it matters what my reasons for making the mistake is, because I think having the ability to mess up hundreds of tags with one little mistake seems like a really big deal.... And it seems logical to me to allow people to protect their files from mistakes like this if they feel they need to. (Or know it will be an issue for them.)
