In wotlk, healers had far too much sustainability and ability to keep a group topped off.
In cataclysm mana will be something you actually have to worry about running out of, so it will be the responsibility of each and every member of a raid to take some responsibility for their own actions.
You have to do what you can to make the healers job easier, and if that means you bothering to click the lightwell then so be it.
It does not need to be made into a healing stream totem. That is a poor excuse used by lazy players, the sort who won't use healthstones now, but complain when a healer doesn't get to them fast enough.
If you have the tool to save yourself, at the expense of one position on the meter then you can and should use it.