First time I hear that of possible infection due to wearing of pantiliners. I really dont see why that could cause an infection. I can see why tampon could cause an infection (TSS) and thats why pads have always been safe. Pantiliner same as pads, tampons etc. should be non-scented to prevent risk of anything.
I too being wearing the pantiliners everyday for couple of years now and I dont feel Im using anything at all. I dont think I could get used to not wearing them now.