Well it depends rather heavily on what it is you admin.
I look after servers being used by hosting companies, so thats, web, mail, dns, mysql, cpanel, directadmin, plesk, windows server ,etc.. Not exactly the worlds hardest task.
I couldnt speak for the more mission critical admin jobs out ther like keeping google ticking over smoothly. I wouldnt know where to begin.
But yeah my job is pretty easy.