I guess the definition of "too much" is highly personal. LOL! I have an "ample number" of lots of things, but I will use them until they disintegrate or break and simply won't have to replace them for a long time because I have more. Like socks, kitchen cloths, mugs.
I do have too many books and need to think about weeding them. (Operative word = THINK. Not ready to DO yet!)
I probably have too many empty but useful glass jars and bottles (in sets, of course) - but we want to make homemade (fillintheblank) someday and they will be perfect!
Too many sewing machines. I admit it that I own more than one. Leave it at that.
I think we have too many DVDs and videos, but DH insists that he watches them over and over.
We have too many CDs, but they are comfortably stored and we do enjoy many of them.
We have too many spare towels, but they are so USEFUL (like when someone is muddy or sick), and I have ample storage space for them, so I don't think of it as excess.
After Christmas we might have too many spare pillows. After a lifetime of never having enough, this won't feel too bad. Some people in the family might decide to have two on their bed instead of one. Really it will be a problem of not enough pillowcases, not too many pillows...
I'm not a minimalist in that I feel best when I have a spare or two of something that we'll eventually need a spare of. But I also don't keep stuff that we don't find personally useful or satisfying (and hardly anything that isn't functional in some way). So the multiples I keep do not usually equal excess in my mind.