I agree. I always try to write error handlers using "or". Preferably with "or die", but "or do" isn't a problem. But it is certainly not now. I have been doing this for just over a year now, but I have copied it from someone else.

In my style guide is:

Error checking is done using or. This means open or do { ... } instead of unless (open) { ... } when handling the error is more than a simple statement.