state of mind
As others have indicated gunkholeing is a state of mind and can happen in any boat. To press the point, I have 'gunkholed in my kayak by paddling a small shallow lake (Whirlpool Lake, Riding Mountain Park, (it, it self could be considered a gunkhole, then we paddled up Tea Creek that eventually was less than 3 feet wide, and only a few inches deep. We moved along by pulling/pushing at the shore alongside. Eventually, we had to take to ground to turn the kayaks around and go back to the lake. We had lunch on board and a wonderful time. In my mind that constituted gunkholeing as much as it does in my 9" draft daysailer. With it, I usually hit shore, before I ground out.