Have the people complaining about cloaking NBs actually played a cloaking NB?
DK, sorc and templar all have anti-NB abilities built into their class!
Some of the alternative counters to cloak are listed above. There are at least 2 more I know of.
Also, if you are getting picked on by NBs because you are low CP, try slotting radiant magelight, at least while traveling.
You'll have a 100% counter to stealth ganks.
If cloaking NBs really are ruining your enjoyment of the game and you don't slot an anti-nb ability on your skill bar, try carrying some detect pots. That will give you a chance to even the odds and the average NB will give up and run away.
If a NB is skillful enough to beat you even if you have used some counter-measures then that is his/her deserved win.