I'm currently in a campaign with 3 PCs, a wand wizard, great weapon fighter and me, a TWF ranger. Second wind is obviously our only option for healing in any given fight with the exception of a few fighter powers (unstoppable temp hp I think).
In any given encounter, my ranger and the wizard have a lot of ways to avoid incoming damage through our various utilities (and the wizard always makes it very clear that he always has invisibility up his sleeve so that he can run away and leave us in the lurch if things go wrong), most of the time, the fighter is the only PC who would need to use his SW.
My point is I suppose, that as a party, we aren't accustomed to receiving healing, and as such, if we are in a position where we need it to survive, then its appropriate 'punishment' to lose our standard action, as we would only ever use it when we don't have a choice, ie we don't think we are going to kill them before they kill us.
In our group, making it anything other than a standard action would make it a no-brainer in every encounter for sure, as soon as you lose more HP than your surge value, use SW, there's no reason not to, and that takes away the tactical element for me (which I like).
In conclusion, I don't think SW 'needs' to be used more, I would leave it as it is.