Congrats on your upcoming retirement! This is a wonderful thread filled with great insight.
My thoughts... retirement is no different than working it's just a different 'routine'. We still must set goals, establish priorities and discipline ourselves in order to accomplish what we wish. I find if you don't manage your time & energy well then everything about you ages very quickly. I'm actually much more organized than when I was working and feel much more accomplished too! I'm also more decisive about what 'things' are useful vs useless in my sewing room (in my entire home as well). As for working through stash or acquiring more - I think it's a personal preference limited only by ones finances.
Congrats again - I'm sure you'll find what works best for you and I hope that you enjoy it to the fullest!