Consider that a cyclist who appears to "suddenly take the lane" may be swerving around a road surface hazard, which drivers either don't notice, or don't consider a hazard. I find that most cyclists try to share the road as best they can. I will stay within a foot of the edge of the road as much as I can. But occasionally, I see a pot hole or wrongly placed sewer grate, and have to move more into the lane to get around it. it's just the way it is, not everything can be perfect for everyone, including car drivers. By maintaining my driver's license, following the rules of the road, and paying my taxes, I feel that I have the right to use the road, with the responsibility to share it as best I can. I don't feel that I have to surrender the road to a motorist, just because they are impatient. On very rare occasions, where traffic is heavy, and a lane narrows in construction zones with an unsafe shoulder, I have for a hundred feet or so ridden in the middle of the lane, to purposefully assure myself safe passage for a short distance, sorry if I delay a few motorists a few seconds, it just happens every now and then. Historically, I have delayed motorists, and "taken the lane" more on my tractor, than on my bicycle!
Motorists need to remind themselves, that occasionally, the lane/road is simply not available for their convenient use - sorry! I have retired from 28 years as a rural volunteer firefighter. During that time, I have closed a lot of roads entirely, sometimes for hours (once for four days - train derailment), and sometimes, just with my car, as our red trucks were busy doing something more important than just sitting across a road. I would feel really badly looking a driver in the eye, as I signaled, then stopped across the road, knowing that I'm about to take an our or so out of their day. But I know that up the road, their are hydro poles and wire down on the road, or a car accident, and they cannot safely get through. I got yelled at a lot, but would explain that the road was legally closed, and it was not my fault that there was no detour route. If there was, we were not permitted to give directions anyway, as one of our FF's did one day, the motorist ended up in the ditch on the detour, sued the township and won. So, after that, we just closed the whole road. A stopped motorist may get angry, but they won't end up lost or in the ditch. Despite life's best plans, we cannot always have what we want, the moment we want it, we have to understand, be patient, and share...