I haven't yet posted much on cloudynights. I prefer reading the posts of people who know a lot more than I do. But I thought it might be worthwhile to share a bit about my recent experience of night vision with galaxies, even if most of this has been said before.
After a lot of informal research, mostly on CN, I took the plunge earlier this year with the Televue afocal system and a new 10" Orion goto dob (recommended by very helpful CN members), which replaced my old Criterion 8" SCT. Since then I've enjoyed many hours of backyard viewing.
I especially enjoy galaxies. There were differing opinions on this website about NV and galaxies. Some said the benefit is only marginal, or that it just helped with certain types (edge-ons but not face-ons, etc.). But when I asked for feedback, the generous response from NV enthusiasts convinced me it would really make a difference. After 3 months of using NV, I can definitely say it has.
When I compare regular views with NV, using the same eyepiece, I find that NV makes every type of galaxy brighter and much easier to see. It may help some more than others, but there's nearly always a distinct improvement. The larger, brighter ones show far more detail and structure, including spiral arms and dust lanes. And many others that I could barely see on the best nights, or only wished I could see, are now easy targets.
With NV I often see multiple galaxies in the same field of view, something I hadn't experienced before. I can also see them at much greater distances. My total "repertoire" of observable galaxies is easily 10X what it used to be. The same night sky that offered just a few dozen galactic gems is now full of them.
NV is brightest at low powers, but many galaxies are quite small so I've tried using some higher power eyepieces. If they're not too dim, I can boost the gain a bit and get nice views up to about 100X (using an 11mm eyepiece), definitely brighter views than with the eyepiece alone. With moderate light pollution (Bortle 4-5) I've found that the unfiltered view is best, which may help with higher power.
Astrophotography had always scared me off, but I was surprised at how easy it is to take simple phone pics with NV. I've taken around 200, mostly galaxies or galaxy groups. They're obviously not high quality astrophotos, and I get some coma and occasional star trails, but they're quick and easy: 1-minute exposures with the "Night Sight" camera option on my Google phone. They show more detail (and sometimes more galaxies) than visual NV, and you can "zoom in" for a closer look. Even with goto, I'm not always sure that I'm seeing what I was searching for. With the phone pics I can capture views and later check Stellarium or other online resources to verify the targets (or to find out what I was really looking at!).
Night vision astronomy was a big step up for me. My observing experience and technical know-how were pretty limited. But the learning curve wasn't too steep, and it's made a huge difference in what I can see and how I feel about the night sky. Besides galaxies, I've also had pretty spectacular views of star clusters. Not many nebulae so far, but summer is here and they'll soon be climbing above my tall trees.
I attached a few phone pics (with some enlargement): M100+companions, NGC 5746, NGC 3718+3729+Hickson 56 (marked), and Abell 2199. I marked about 40 galaxies visible in the Abell group. It still blows my mind that I can step into my back yard and, with a few amazing tools, see vast island universes nearly a half-billion light years away!