The only time I would view cheese as distasteful is if there is some game breaking mechanic, where if used, will almost guarantee a victory no matter what the opposition does in attempting to thwart it. For example, in SC1, before it was patched, it was possible to park a seiged tank under a building by forcing it to move under and go into seige mode while the building is landing. This protected the tank from melee very effectively. Exploiting a mechanic such as this would be considered cheese. Putting an early tank on top of a plateau in LT, on the other hand, when the other side has not scouted you and has no counters to it, should not be looked down on.
Most of what you listed I would not consider distasteful, though to a beginner player who have not learned the game it may seem very hard and difficult to defend against and consider it broken or 'cheesy', but over time they will realize that these moves, with proper scouting, leaves the opponent at a serious disadvantage if done properly.
Most complaints about this feel like sour grapes.
That is exactly right.
Further to this, can anybody tell me if using such tactics will adversely affect your chances of promotion/demotion?
Promotion/demotion is solely dependant on the rank of the opponent you are facing and your win/losses. Whatever tactics you use in the match will not affect that.
This does not only apply to SC2 but most games IMO.
This question also has some great answers.
I have slightly revised my answer (changes in bold) since I felt, based on the up/down votes on this answer, that I was unclear in my own use of the word cheese interchangeably with the word distasteful.
I do not disagree that those tactics are considered cheesy, but the main point I was trying to say, (rather poorly) is whether or not if they should be viewed with disdain.
I do not view cheesy tactics with disdain since they are a part of any proper strategy and should be a valid play in any competition. Taking an (American) football analogy, a surprise sneak attempt on 4th down, if the other team is not prepared for it, gives you great field advantage. However, even though most teams expect a normal punt, they are typically prepared to defend against the 4th down attempt since it is a valid strategy that can be used in a game.