I tried switching one ele to resto for all of a couple days and since I'd never used the dedicated healer approach with my crew I found that it caused many more issues than it solved (but that was all playstyle and the fact that my last dedicated healer was a holypriest healbot in my 2boxing days).

The healing setup that I used from TBC through ToC10 was:

g: heal tank (lhw x4)
shift-g: heal self (lhw on self for each sham)
ctrl-g: lhw spam on tanks target or targetoftarget

h: chain heal tanks target or targetoftarget
shift-h: chainheal self