Definitely some valid opinions, and I just want to be clear that I am in no way disrespecting you or your thoughts above. I just want to throw a couple of my own opinions out there.
I have no issue with cyclonic rift, using it myself or being used by someone else against me. It’s a card that doesn’t win the game alone, in the same way that a craterhoof only attacks for 6 if cast into an empty board. If I don’t have much going on on my side and I cast a rift, all I did was either protect myself or try to reset the table back to where I am at. If I have a game winning board state and use it to clear the way for a lethal attack, all that rift did was clear out defenses, which any card granting an evasive ability could do, such as a wonder or filth in the graveyard or similar effects, or even the Plague Winds style of cards you mentioned above, which doesn’t need to be at instant speed to get rid of blockers. A world fire setting everyone to 1 life is pretty much a game ender I agree, since 1 life is basically dead and it can easily take just 1 card to finish the table. While a very versatile and very very powerful card, a cyclonic rift doesn’t do that, you need far more to go along with that rift to get anything done, it isn’t a game ender by itself.
I do disagree with the notion that a cyclonic rift undos all the previous magic play before it. Did nothing happen before that rift other than people building board states? Did life totals not change? Graveyards filled? Cards Drawn? Things exiled or destroyed? If the table only sat there building up those battleships, without interacting with one another, before that rift came down, that table has bigger problems. If magic is happening before a rift, things should all ready be being destroyed or removed, damage done, if so then a rift is not like resetting a whole game, sure it is a reset, but if it makes everything that happened before it irrelevant, like I said before, the table has bigger problems to figure out.
I’m not saying a cyclonic rift can’t slow down a game, but so can numerous other Commander staples, stax/prison strats, board wipes in general, land destruction, planeswalkers, tutors, even sensei’s divining top. Even just playing the whole no rush 20 mins(old Starcraft reference for the old people out there) build your battleship up style of Commander is a slow way to play.
I’ve been in numerous play groups, in various states and countries, but my current one aims to be a hard 75% power level, we play with powerful cards and tuned decks, cyclonic rift has not been an issue for us. Though I fully understand that every playgroup, every LGS, or just any table you find with be different.