For those - like me
- who tend to forget to set EC back there are two things I use to minimize the risk.
One is this ...
I am quoting myself here and I hope that is OK. This is a good time to review Steve's post on how never to mess up a shot again by always reviewing the information in the viewfinder. With +1 exposure compensation a ± icon would be included in the information at the bottom of the viewfinder. In the excitement of shooting this is easy to forget, but it should become a habit that is ingrained in your shooting style.
... and I still have continuously to remind me looking at it. BTW there is a second one usually left hand side of it for flash exposure correction. Just in case you wonder why the top display shows zero and you still see a +/- icon, it's the one for the flash. They are different but it is sometime easy to get confused, espeically if you don't shoot so often. In A mode there is a more prominent sign for EC not being zero. IF EC is activated there you will see the exposure meter graph in the viewfinder that you normally only see in M mode.
For those who have camera like the D750 or a model of the same (newer) generation with User Modes:
EC is one of the parameters that are stored as the part of the user setting. So, if you store your preferred settings with EC 0 as user mode(s), everytime you change the to a user mode or from one user mode to the other, EC gets reset to 0 if you stored it as 0 in the first place. The EC value set for the other modes M, A, S, ... remains stored separately and doesn't get changed. So e.g. if you are in M and set EC to -1 you will still have the EC set to -1 after changing to A or S.
As I am either working M or A I have my favourite settings stored as U1 and U2, use them all the time and may tweak the settings as needed in the situation. Just by flicking the wheel one postion and back and forward again evrything is back to normal again including EC set to 0.
P.S.:
I could only check for sure for D750 and D7200. I know there were models that had user modes that weren't working the way they should, so I can't guarantee for D6x0, D8x0, etc. but it might be worth trying, if you find it useful for you.