I wouldn't mind more challenging healing myself (though only slightly more, since I think it's already plenty challenging), though I hope you haven't forgotten that we're at the end of an expac and it's only natural that you're overhealing just about all the current content and there IS an impending ilv crunch coming that will no doubt change healing across the board, especially coupled with the new content which everyone will face in green gear at best. Your healing toolkit is about to be a lot more relied upon.
So why ask for more? The pedestal you stand on is about to be kicked out from under your feet and is only ever temporary anyways. Lay off the demand for more dps buttons till you see the true amount of changes. Healers are fine the way they are without these weird desires for more complexity to fill small downtimes that are likely about to vanish for the next several months after launch.
Stick to healing and stop whining about how boring it is, or play something else for everyone's sake.