Of the times I see Lightwell used it is placed in some ridiculous position like far enough behind everyone they cannot see it to click if they were planning to. Fights that involve a lot of movement can both make Lightwell access easier or harder depending on the situation.
If your guild continually will not use the well, respec and and spec out of it, buff your active healing talents and don't waste your time on the well, its not worth it. Its not a super heal anyway, but yes every bit helps, but it isnt helping anything if it isnt used.
A bit Off Topic:
Now to some issues with "Lightwell Casters" I am not saying this is you, but many a LFD run or trade pug the Holy Priest specced into Ligthwell will drop it and say click it, while in the meantime during the fight barely healing a smidge and claiming the lightwell was there. Putting down a lightwell is not an excuse not to heal if that is what you are there to do. Any competent player knowing they need to stay alive will click a well if it is accessible, dps loss or not. So those of you that do, Stop using lightwell as an excuse to not do anything....its lazy, if you dont want to heal, don't queue as a healer.