In reply to Pursued by a bear:
I also enjoy guidebook terms like 'thought provoking,' climb 'with interest' etc.
I don't see these as clichés in the same way as 'lost in a sea of rock' because these seem like set phrases which, although they are full of understatement, have come to mean something specific. Also, they represent the enjoyable dark humour found in the best guidebooks.
http://www.ukclimbing.com/forums/t.php?n=206599&v=1#x3021192
'Lost in a sea of...', 'mecca for sport climbing,' 'living rock', 'like a human fly,' are the clichés for me because they detract from the images/places/actions they describe.
And after reading through this thread, if I ever read 'like a human fly' I will always imagine said climber licking faeces from their legs.