Agreed! The cramped screen space (I run dual vid cards in sli with 4 monitors with development apps spread all over them!), sluggish response (open what I have running on my work station and any laptop goes into crawl mode), heat (if you really run it in your lap as the name infers) and that just touches on the very start of my list. Yes, I have few laptops and use them when I 'need' to and one often times goes with me when I leave my office (but my phone is rapidly replacing that need unless I'm going for days)... but why on earth would I consider using only a laptop? Well, if I was always mobile, but I'm not. Maybe if I didn't need to run any development systems... Eclipse on a laptop certainly works, but is sluggish vs. a workstation. Open Dreamweaver, Photoshop, Eclipse, three web browsers a secure shell or few, email, IM, and then need to open a Word attachment and most laptops chug to worst than a crawl.
And the funny thing, from my perspective at least, is that I'm sitting beside a laptop that routinely has several VMware VM's running (XP & Server 2008r2), several line of business applications open, and has dreamweaver *and* gimp running in the background. :) All this on a two year old i3 w/ 6GB RAM. Set me back around $900.
Larger screen? VGA or HDMI outputs. ;-) Nothing quite beats working on a 55" HDTV in your living room, especially when I have time for STO.