That's my experience too. As a junior, however, I couldn't tell good employers from bad so I tended to pick bad ones (they vastly outnumber the good ones, after all) and then stay with them for far too long.

I mean, I value continuity and a healthy long-term relationship with a reciprocating organisation more than most, but the first few years I spent at a crap shop for crap pay and with only fear of my superiors motivating me? I think I could have gotten the same experience but better in a few other places I've been since.

(On the other hand, maybe that first experience is what made me so picky in selection of employers after that?)

The problem is where to find these companies. Job review sites are either turfed by companies who tell their employees to leave a good review, or by disgruntled leavers who want to unload.