I think noone is complaining about that. Its the rewards at lower levels, especially crafting patterns, that I feel forced to grind for. I am, however, after I did all this for leatherworking on my main, not going to do it for enchanting and tailoring on my main twink. Seems I am not a real crafter any more, and that is a shame, as I enjoyed crafting quite a bit.
Also, @OP concerning szenarios: Only the first one is 30, all following are 15. And I believe the first heroic is 60 and are following give 30 valor points. And I find heroics in general easier than szenarios. They are longer though.