Anybody have tips for getting use to boating (and rolling) without a nose plug?
I'm not sure where your roll is at.... but having a more intuitive roll, rather than a mechanical roll, can help tremendously when dealing with nasal douches. Paddlers with intuitive rolls spend so little time upside down that nose plugs and storing enough air in the lungs becomes a non-factor. If I were still having to 'set up' and therefore spend more time underwater then I would probably go back to wearing noseplugs. With that being said... even the intuitive roller can find themselves in situations where they spend a long time upside down. But in these situations it would probably be rare that a nose plug would be something that would have changed whether or not they could have stayed in their boat a few seconds longer before swimming.
If the quicker roll thing isn't possible then you will just have to try to get used to blowing air out your nose at a reasonable rate. (I have never tried the humming thing, but I am going to have to give it a try sometime.)
I haven't used nose plugs for 6 years or so. I playboat and creek. The only time I wish I had nose plugs is when I fail a back loop attempt, and get an atomic blast of water surging up through my nasal passage. Other than that I just got used to blowing air out my nose when upside down.