This is exactly where I'm at right now. Though you're 6 months ahead of me, our experiences sound identical. I'm able to move very quickly and make decisions on the fly (user today after I pushed an update: "Wow, so fast! Do you ever sleep?"), which has been extremely beneficial thus far.
> That said, it is considerably easier to get in a funk as a single founder working longer hours than anyone else, constantly pushing forward without any discernible support.
Yes. Interestingly enough, I've found that when I get in a 'coding funk', switching to sales mode is a nice way to 'unfunk'. Instead of writing code, I write emails, reach out to existing users, and foster relationships with potential future users. Not only is it nice to interact with people, it is just as important as writing code and something that has to be done at some point. So why not do it while taking a break from coding?