I can 100% agree with this. There may be cases where you simply have to use a new tool, but I always hate to do so. Another dimension to this problem that you haven't mentioned is configuration. I have over 1k lines in my .vimrc and have automated quite many editing tasks; I have a heavily customized bash prompt that shows me all the information I need, etc.
As developers, we never stop learning, even about the tools we've been using since forever, and using a new tool means starting from zero. This means both a drop in productivity and in comfort. (And an uncomfortable developer is more likely to introduce bugs [source: my experience])
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