I don't use electronics for the most part, but then again, I mainly fish small ponds and lakes that I know extremely well, and where dipping your rod is all you need to figure out water depth and bottom composition. When making short day trips to bigger water, I admit, electronics help me a lot (my friend has a basic one on his boat), but I mainly just cruise around looking for the right depth on points and ledges, or if I'm lucky enough, some form of structure in the depth I'm after.
But an example- last time I was at Bull Shoals, I was able to rent a boat for an hour, and hooked a 3-4lb kentucky on a jigging spoon (spit the hook at the boat). There were seats and motor on this boat, nothing fancy, but I had a lake contour map I had looked at, and found a spot that looked decent, so that's where we fished. No electronics, just educated guessing.