I love lip liner; I never wear lipstick without it. I tend to use it with l/g as well. I don't do the heavy 90s line (I didn't do it then either), but I think they add a lot to the look. Sometimes I just line my lips, sometimes I blot the colour down onto the lip to either make the look last or to change up the shade of what's coming next. I love that I can create completely new colours by adding a lipliner. The same lippie can look completely different because of the liner chosen.
I adore Kinda Sexy - but only when I line with Nice N Spicy. It just faded away before that. Same with Razzledazzler.
I love Chicory liner - great colour for me. I've been wearing Ravishing l/g over it all spring to give me an orange lip that I really like.
I couldn't make GAT l/g work - I'm now wearing More To Love liner (sheer application) and then layering some Lust over it. It's still pink, but it warms the colour up just enough to make it wearable for me.
None of my liners collect dust. I love and use them all. Nice N Spicy, Chicory, Spice, Burgandy and Red Enriched are staples I reach for again and again.