Its the best spend IMO
1. no, me neither
2. not so much. I'm just keywording or basic date sorting,
3. sometimes. But usually I do most of my editing in LR. then I import to edit in CS - cloning/nosieware anything I find easier in CS- then I save a version of the 'finished' picture in my documents for that month. so my LR is all my raw files, untouched or partially edited photos mostly.
one day, when have some extra hours -hahaha- I intend to sort that out and only save in LR. binning the not used not wanted photos from multiple shots, keeping the editing ones -and original unedited versions of those.