> Examples: Why can't I comment  out a whole block  of code  at once?

You can. Just add the "Comment Block" and "Uncomment Block" function
to your menu or toolbar.

> Why can't I drag a variable  name into my watch window  instead of typing it
> in by hand?

Not drag and drop, but you can select the text of the variable (double
click) and then do "Quick Watch" or "Add Watch".

> Why is it so excruciatingly difficult to delete  empty rows?

I'm not sure what that means. Are you just talking about holding down
the shift key to select a number of rows and then hitting the delete
key? If so, that's pretty easy.