You have several options, but I can't say which is going to fix your particular issue.
Remove the shortcut for the Move tool. If you have CC, then you can access this from the Edit Toolbar
If you don't have CC then gor Edit > Edit Shortcuts
The other option that mighjt be affecting you is Auto select
A lot of people find this feature annoying, and prefer to uncheck it, and enable it by holding down the Ctrl (Cmd) key while clicking on a layer. Note the Layer drop-down. This can be set to Group, which is also annoying IMO.
If I am not interpretting your question correctly, can you provide more details please?
I have the same problem. Basically us artists like to be able to hold down the Command key without it doing anything, because we never really use the 'Hold down command to move or select a layer' feature, we only hold down command to press Z immediately after to undo something. I have also not been able to find a way to turn it off.
Look closely at your workflow. If you want to work more quickly, then consider using a keyboard with programmable keys. For instance I use a Logitech G910 on which one of the G-keys steps backwards. So a single press of that key undoes one step, and another press the step before. It makes for a fast fluid workflow, and I obsess about having to move the cursor or my fingers and inch further than I need to.
It's just odd that this has been changed. Has it always been this way? I've now gotten used to pressing command + z, so It feels akward to bind it to another key. I was looking for a way to not have to change habits, but rather settings. Thank you for the reply though