I'm not sure whether it will screw up your monitor... That is a good question.
I don't usually allow my monitor to sleep so I don't come across this issue that often, I dont know if you can disable monitor sleeping while plugged in or something, im not familiar with all the options in OS X control panel, and I'm at work.
Using Control + Shift + Eject seems to be the easier way to get out of such mode. I dont feel like plugging and unplugging a lot the mini DP port thing, I hate those adapters, make me feel like after a few time of use they are going to become loose and unplug by any sudden move.
We cant do anything but to wait for this.
I went to an apple store and talked with the so called genius and they dont seem to be informed of this issue at all. Apparently it doesn't affect a lot of their cinema displays, and when you try at the store it works fine there so they assume it is your non-apple monitors fault and incompatibility, or so was the experience for me and i got quite mad at such lame support. I pointed out that a lot of users complain about it in the apple support forums, 90+ and his reply was: "well, you know most of the time is one user posting over and over"
We dont have much resort but to wait for a fix from apple.