I talked to guy a couple of years ago in a streamside parking lot who said that he hadn't been fishing his one handed rods much that year because he was using a spey rod to nymph in very small streams most of the season. The long rods let him reach over bankside brush to dap his nymphs at the head of the holes and let them drift back under the brush with great success. It sounded like a fun way to catch brookies out of streams you can step across.