I use it, for tasting notes, inventory, setting drinking windows and just recently, noting where I bought stuff.
I do read other's notes, but a pinch of salt may be required at times.
Drinking windows... as I said, I set them for my own wines, indeed I'll even do this where the community average is pretty much the same. All it needs is some muppet saying Sierra Carche will improve over 30 years and the average shifts from a sensible drink (or at least dispose of) now, to something silly.
Where I don't know a wine at all, plus have no experienced opinion to lean on for suitable drinking dates, then yes I'll pay some attention to what's been input. The salt shaker comes out again of course, but if I have no idea, I figure that the downside of considering someone else's opinion isn't too bad.
As for tasters 'to follow', I've not gone down that route yet, but note that some poor misguided fools have marked my notes down as 'of interest'. That includes people like Otto who really should know better than to expect sense from my TNs
Perhaps the best taster to follow though is Eastover. Eric Le Vine is threatening to write a little utility to shift their notes from public to private notes, so grab a sample while you can. They're always clear, accurate and informative notes, with only one small catch...
regards
Ian