Line counters? Depth finders? I know If I want to catch fish in canoe country I can do without either of these items. And I know through many years of trial and error (much like db's admonition of "know your tools") about how far back to throw stuff..........(Oh, and db's right again, if you toss your lure back to begin a troll you risk a snafu).......
But here's where I'm coming from with the combo use of line counter and depth finder.........
I know some folk think like I do........fishing is a hassle.......there I said it! Yup MT thinks fishing can be a royal pain in the keister. I silently mock those bumper stickers that talk about the worst day of fishing being better than the best day of work.......baloney! Tangles, snags, endless knots, biting flies, equipment malfunctions, having to "deal" with fish etc. etc. all add up to a layer of complexity that can detract from what would otherwise be a peaceful day of being on the water. Sort of like that saying they have in golf......"A good walk spoiled".....

But I love it......actually OCD about it. When I'm paddling and solo there is a 90% chance I'm running a line (when your with others the parameters change in accordance to what is the accepted norm......"when in Rome do as the Romans" but I digress). So, if your going to make any progress whatsoever you absolutely cannot be hanging up all the time. So you run something that doesn't run real deep (I ran the old discontinued style balsa Husky Rapala on the Hunters Island trip).
Enter in the Line counter. How sweet to know my lure is running at 28ft. Yes, you can get that precise because at 26ft you tap bottom. Here is the big difference for me since I like to run a line pretty much all day........I can now be
proactive instead of
reactive. Instead of waiting for my lure to clang on that rock pile and react ("Oh crap") I can be proactive>>> look at my depth finder and say "whoops-se-daisy.....up we go" and crank in a wee bit before the hassle starts. And not only that I can fine tune my lure to run over the top of that rockpile, maybe even tick a few of the bigger boulders.
So for me the line counter is probably a bit less about catching fish and a bit more about being able to paddle efficiently from point A to point B in a more relaxing manner. Trolling near the bottom while paddling all day can actually be accomplished without pulling your hair out. The 10 days I spent mostly trolling on Basswood this past summer taught me the value of the LC........quality time, less hassle.
FWIW.......not into depth finders or line counters? Want to still maybe bang a meal or two for when you roll into that evening camp? You can do much as I did on my Hunters Island trip and do it without much hassle.......Pick a "minnow" type lure of at least 4" and let it trail behind. The minnow type lures sport a small lip and typically only dive some 5'.......Very little effort to pull these types of lures and you will catch some fish without much effort or bother. I caught something everyday. On Kawanipi I wasn't able to go very far without hooking up......didn't get real far that day until I decided to stow my rod and take advantage of the calm. The only caveat is I would strongly suggest a rod holder........remember MT's motto, "no hassle".........rod holders let you forget that you are even running a line.