Maybe that's a bit of a lie. On the rare occasions that I need to, I do know how to tie a nail knot to connect fly line to backing and an arbor knot to attach backing to reel. However on the whole, the only knot I tie for like 99% of my tippet to fly connections (which are 99% of my knot tying situations) is the improved clinch knot. Heck, I used it when I was fishing with spinning tackle and lures and using swivels and all that stuff too. It's quick, easy, and seems to faithfully get the job done.
That said, I also tend to catch small fish. I like chasing small stream trout and (out of convenience) the stuff that lives in freshwater ponds. I'm sure my improved clinch will fail me at some point should I ever hook that big carp or redfish or manatee (joking), but I really don't recall any situations where I lost a fish due to the knot being the weak point.
Is there another knot I should be trying? I've heard the mono loop knot is good for streamers...but other than that, is there a reason to learn an Orvis or Davy or some other knot to connect a tippet to fly? Or am I being wise to keep the tangled messes to a minimum?
What knots do you utilize in your fishing and why?