It appears that you park the Ps menu bar at the top of your monitor and then access the menus by quickly moving the mouse to the top of the monitor screen where is stops. However, as you note the menu bar does not have focus at the very top.
I have two words: keyboard shortcuts. If you are accessing menu items with the mouse that extensively then you really do need to master some shortcuts. But I confess that I use a tablet pen that allows me to type keyboard shortcuts without releasing the pen. Admittedly harder to do with a mouse.
Just to be sure I understand the issue. On a standard WIndows application you do not get this behavior (because menus appear much further away form the display edge)?
In order to maximize the vertical space available for documents (as opposed to UI), the Photoshop application frame combines the application menu and the "window move" area.
The top of the application frame is used for moving and not for menu items.
There are a few reasons for this, one being that this is necessary to designate this area as "move area" in order to get proper peek and shake functionality on Windows 7.
Yes Jesper, couldn't be further from truth - the area at the top alongside the edge is for functionalities reserved for windows, not necessarily for unfolding menus.
However, previous versions (at least the ones I've been using 7-9) allowed for 3 modes of workspace - 1 stnd and 2 full screen (with and without menu bar).
The difference with CS4/Cs5 is that when working in mode 2 - full screen + menu bar, you can NO LONGER access/unfold menus by clicking at the very edge of the screen.
Since I've grown used to that for years, it's really frustrating and odd that it has been changed. Apart from keyboard shortcuts I do use menu a lot and now
the workflow is hindered indeed.
It was simultaneous with the 'application frame' introduced in CS4 - probabaly then this dead area in full screen mode appeared.
To be precise and well-understood - it is an issue in FULL SCREEN PLUS MENU BAR.
I would enter a bug form, as this breaks previous behaviour. It goes against Fitts' law that explains that the target area has to be bigger with the distance, and the edge of a screen makes it endless, as it is the case on the mac side.
I seriously hope that it would be consider fixeable for a x.01 release!