For me it isnt as simple as climbing. I am usually on a 2-4 man crew all of whom climb, going from job to job I need to climb, rake, drag brush, walk in ice, mud, concrete etc.
It can be difficult to find something that does it all. I will take a heavy duty work boot over a rubber boot for all purpose use but I do wear rubber boots sometimes. unless presented with extremely harsh conditions I generally try to stick to one boot per day, as I am not really into changing my boots all the time.
I was just saying gaiters are cool, and help keep you a bit cleaner, warmer and drier.