I've used something similar at the moment, basically putting in /etc/hosts entries to map a fake DNS name on my laptop e.g. "staging" to the real switch ip address, so the command "ssh staging" works.
It works well for the common devices I access, however it's not really scalable enough. There are easily over 1,000 unique CLI interfaces that we support, and call me lazy but jumping in and out of spreadsheets constantly to find the IP/Port and credentials isn't something I enjoy.
Window's with PuTTY/SecureCRT can solve some of the issues using saved sessions that you can export and import.
However I would love something in CLI on OSX where you could type 'mgr'
Then you get a prompt like, '1) switches, 2)firewalls, 3)servers, 4)routers'.
After you hit '2' you get another prompt '1) London, 2) New York, 3) Lab' and so on...
Finally when you select the device it opens either telnet/ssh (depending on the device) and may be even authenticates you in, all with terminal.
Like I said it's a wish list, and I guess I will have to end up making something my self, but no point in re-inventing the wheel if there's already someone out there with a solution :)