A number of people were complaining in chat about how slowly energy replenishes and I didn't notice it until just now (since I was mostly just walking around a small area scavenging). Even the amount of time you spend wheezing when you run out has been increased drastically compared to before. Add to that the heavily reduced run speed (I used to be able to run 5 m/s on grass -- now it's down to 3 m/s) and you've got a lot of frustrated players.
In addition it seems like actions that probably shouldn't use up energy are. Like drinking water. And fishing (isn't that supposed to be a nice, relaxing activity?)
edit: In regards to my comment about run speed, does body weight now affect your max speed?