I'm single handing almost 95% of the time for the last 3 years. I anchor a lot now. I have a windlass switch at the helm, but I still find that I'm pulling the anchor at the pulpit itself most of the time. So for me, I'm there anyways. My wash down is salt. Kind of wish I had both salt and fresh. For volume on a muddy bottom, I would prefer the salt, but as Pascal notes, your not getting a fresh water rinse and that does build up in the locker over time. No question. Actually a smaller volume fresh water fixed spray AND the salt water on a hose nozzle might be the best of both worlds.
I just got curious that I seem to be the only one who still prefers to be at the pulpit. Of course, the device you need is fairly linked to the process by which you operate. If I was not at the pulpit, obviously I would not like a handheld as much. I just find that I have plenty of time to walk the long way back all the way to the flybridge without fanfare. On my boat I have a helm on the same level as the bow, so If I had to run to it in short notice I could, just find that I almost never do.
I certainly remember the days where it took two to anchor, one at the helm, the other at the pulpit. It's just over time that this no longer seems necessary, or even preferred. If you asked me even just 5 years ago I would have a different story.