If you are used to loot normaly and fast. You can stay with that method. But as someone who hate to toss thing arround like armor I never never loot unless I feel lrc friendly toward the noob box; hate to target super small rings to see the 99.5% bad ones and so on.. Grid loot work great for me. I dont need to move anything and dont mind to over. As for things like miasma, is sure has that issue you mentioned. But me ? I dont care, cause really, it just allow me to check the few items I look at in a much quicker manner.
Would it be better then someone really fast in the corpse ? No. Similar ? I think so.
Edit: What I usualy do when description doesnt instantly load up, I check another item on the page and come back. Like, in that screenshot I would of went for bracer then came back to ring. Usualy solve the biggest 'time loss' issue.