Coming from Aperture, one thing that I find extremely inefficient in Lightroom is the inability to lock a custom filter to a folder. I have dozens of image folders, some of which have images curated with 2-star rating, other folders which are filtered using color labels, etc. In Aperture, each filter was locked to its respective folder. However, in Lightroom, electing to only view 2-star rated images causes that filter to stay that way regardless of which image folder you switch to afterwards. As far as workflow efficiency goes, I am surprised this hasn't been addressed/suggested by now (considering Lightroom is at version 5, versus Aperture's version 3). I strongly suggest the development team offer an option to lock Custom image filters to folders (a simple on/off toggle would suffice).
We run a busy portrait studio and sort through thousands of images each month, so workflow efficiency is of utmost importance to us. Thanks for reading guys!
Fresh & Modern Family Photography
MICHAEL KORMOS PHOTOGRAPHY, New York
Well, then, my rant it seems ends promptly :-) Many thanks Rob!