Just installed DevilSpie according to this topic:
The problem is, every time I hit the hot corner, plank disappears. How can I use the specific commands listed in there without minimizing Plank or panel?
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You need to tell devilspie to ignore plank and wingpanel. In the minimize.ds file you should have something like:
(if (begin (not(is(application_name) "wingpanel"))) (if (begin (not(is(application_name) "plank"))) (begin (minimize) (quit)) ))
EDIT: I also updated the instructions in How can I view the desktop?, it is quite a nifty feature and I think it should be available in elementary OS by default.