With the non-modal dialog the layer has already been created when You start editing it, I guess, so You may have to go further back in the history (for example hitting command-alt-Z two times).
I don’t have CS4, but have they changed it that much? Just drag the Layer into the Trash.
Yes, the change from modal to non-modal dialog for Adjustment Layers has proved to be quite the annoyance for many users, it seems, at least initially.
Supposedly some prefer the new way now though.
Selecting the Move Tool (V) and hitting the Delete-button might be more convenient than dragging the Layer to the trash-can.
‘Initially’ my ass. Unless they improve both the performance and the interface design of the Adjustments Panel hugely. They would also have to find a way to float the panel, so it disappears.
The two ‘advantages’ of the panel are as follows – 1 the TAT tool allowing within image dragging to adjust values. I assume for users without the ability to grasp the concept the most powerful tool, Curves. I will admit that when it eventually is fast enough to use efficiently, and implemented smoothly, this may be a good addition. 2 – the ability to alter opacity and mode of the adjustment, without exiting the dialog. More of a choice for inexperienced users who think this should be necessary at all.
At the moment these two, relatively minor for advanced users, advantages are outweighed by the many disadvantages by a long chalk.
You don’t need to do V and then delete in CS4 – the delete key just deletes layers
I just want the ability to Esc out of a move, and Undo.
Who is designing this stuff?
You can now hit the Delete key, which will dump the current adjustment