Hey BigJonMX, this thought has helped some other people with big collections they're wanting to tag, and I thought maybe you'd be interested to.
A lot of people come into MB with some very specific ideas of what they want their database/tags to look like, and then try to use MB/Picard to fit everything into that predetermined format. But retagging all your files is a big shift, and sometimes that can be a good time to re-evaluate what you want to do with them, especially as Picard is a powerful tool.
Probably the most common thing that comes up is people wanting to change the 'feat.' credits, however since Picard supports 'Album Artist' tags it's usually no trouble at all to browse artists via that tag instead of 'artist' in your music player, and still keep the better/more complete artist tags intact. If your music player doesn't support browsing by 'album artist' this might be one of the few times in your music storing life where you get the opportunity to try some other options on for size, eg Foobar2000.
Similarly, if you're retagging all your files, using the MB standards for 'ft' might be something you can find yourself willing to live with, and save some time as well.
That said it's your personal music collection, you know your needs and wants better than me
Good luck and have fun