Hi, I've used Photoshop for thousands of hours over my 25 years in print design, web and games texturing. Sometimes in Photoshop you just want to repeat the last thing you did. Whatever that process or step was, to just do it again, to the thing you've got selected right now. Without thinking about the process's quick key -- or it doesn't have one, then digging in menu's and side bars:
Imagine, for example:
- applying a font again,
- or growing a selection again,
- applying a stroke again,
- transforming again *[1],
- applying a filter again *[2],
- merging selected layers again
- choosing the same proof setup again.
- hitting the Play Action button again.
*[1] I know that Photoshop has implemented relatively new actions Transform Again, and [2] remembers the most recent filter. I love these and I do use them! They're great examples, I wish for more of this, but they are supplemental to their process, and duplicating this for every menu function in Photoshop is not feasible. The solution, in my mind, is an umbrella process which I imagine would be called Edit > "Repeat", or "Repeat Step" (it could live under the Undo, Step Backward/Forward part of the menu.)
I know that a lot of Photoshop actions have their own quick key, or you can bind your own. And out of necessity and fimiliarity with the app, i've learned a lot of them, and customised and added a few of my own. But I really think a Ctr+Shift+Z or a Ctrl+Y would be a great addition to my workflow. There's precedence in other apps, for example:
- Maya 3D. repeating any step. (they use the keypress G.)
- Office tools like MS Word and Google Docs. (If you do something like formatting, or hit enter, or paste, or create table; then if you Ctrl+Y, you apply it again to your active selection or in the spot where your cursor lies. It makes a lot of sense and saves a lot of time.)
Hope that helps!