Yes but Photoshop has the tools and buttons to accomplish the same thing. Generally you learn those first, and the hotkeys second. Jumping directly to the hotkeys, especially without any sort of hotkey chart, I find off-putting.
Is that a good idea or not, I wonder? Wouldn't people with Photoshop be using it instead of this? Seems like it might be a good idea to target it at non-PS owners.
As a web designer that primarily uses Photoshop, I'd say it's a great idea. Photoshop is horrible for web design. So horrible that I design purely in the browser now. This is going to be a nice addition to my workflow for when I want to include something shiny.