I started working out at gyms in 1987. In 2002 we bought a home and got our own equipment so I canceled the gym memberships, but long story short, I stopped doing legs and I ended up with knee surgeries as a result.
I've started going back to gyms in the past year specifically to do legs, and I have noticed two changes:
People had always hogged machines by laying on them in between sets to prevent anyone else using them, but now they have something to keep them on the machine even longer: looking at the phone. They will sit there for five or even ten minutes in between sets. There is a series of five machines I rotate around when I go, and more than once ,when I first get there I have seen someone on a machine I eventually want, I do complete series of three sets on all four of the other machines, and the fifth machine still has the same person staring at the same phone. At no time do I glance over and see them actually using the machine. Every time, on the phone, in between sets. Maddening on a few levels.
But, also, I have found that when I do approach someone I have seen on a machine I have worked around and I need that last machine before I go home, and I ask them this exact question: "Do you think you'll be much longer?", I have never once gotten anything less than a cordial reply and an offer either to wait just one more set OK?, or even allow me to work in. People seem much cooler about sharing machines with others now, and they're normally very good about wiping down. Back when I went the gyms before, people would get super agitated if you approached them and bark at you that they'll be off the machine when they're goddamn good and ready.