Well, it was a good thing that I had it. The doc removed a 3 mm sessile polyp and a 10 mm flat polyp, the latter being larger and more worrisome, but not a source of immediate trouble. Depending on what the pathology report says, the next colonoscopy will be in either three or five years.
The prep was a bit of an annoyance, but better than the alternative.
And everything worked out all right in the end.