I have never routinely worn them, until recently - I am approaching the menopause, so my cycle is a bit erratic, and it helps not to be caught out. I try to use the smallest ones I can, so as not to constantly be sealing my bits in with a plastic pad, even if it's paper/cotton-covered.
The rest of my life up until now - no, not at all, and really not needed. That's what clean knickers every day are for! I also think my general health and freshness has been helped by not putting a bit of cotton-wrapped plastic up against my bits all day, every day. Plus they aren't cheap.
Some women do need them, but I think many women don't at all, but have just been sold the "freshness" angle, when it is the very opposite of fresh. With knickers, there's a chance for whatever little moisture there is to dry out naturally, but with pantyliners you are trapping the moisture between your bits and a plastic barrier, and it doesn't dry out at all. Blergh.
I can't wait until the menopause is over and I can go back to just wearing clean knickers.