I too find the invisible bleed area very difficult. @Fixx it's not good enough simply to know it's there and that it works. If we have an image on the edge of the document, most printers require that it extends all the way to the bleed line (that's what bleed is for). So what are we to do, just drag and guess, or manually move the position by 2mm (might require resizing too if we are touching 3 edges with the one image? This is a deal breaker. Drawing a rectangle around the artboard with no fill does not work even with clip to canvass turned off. Visibility is absolutely limited to the artboard edge in artboard mode. The rectangle is invisible unless it is entirely contained inside the artboard, as with all other elements. So we can make our artboards larger by the bleed amount and draw a trim line, but then the export miss-reports the document finish size and as @looksliketired has pointed out, with multipage documents, turning off these manual guide layers for each export is too time consuming.
I'm really trying to love AD. So many good ideas and implementations and I'm so angry with Adobe. But I'll have to reluctantly crawl back to Illustrator. @MEB you keep saying "in a future release" but can we please have this issue prioritised? I've just downloaded 1.6.4 in hope - but alas. I think it's time that the designers see this as a design mistake - not a future feature request. You're driving us back to your competitor and, for me at least, wasting my money on my AD purchase.