Do you bother to explore mineshafts when you come across them? I haven't been playing that long but I recently started exploring one and it is huge. Lots and lots of twists and turns. I looked in some of the chests and found things like gold bars, apples, bread, horse armor, seeds, records, etc. Didn't seem really amazing as I could farm a lot of that in quicker time than it takes to explore a shaft.
So is it worth it to you and is there anything in there I might be missing out on if I pass them up? I had to use wooden signs to keep track of all the turns or I'd get lost. I placed a sign at every stop and marked things on it like "dead end" or "unexplored" "lava ahead" "skeleton spawner ahead on right" etc. etc.
Any other tips for not getting lost?