alias bouncer { server $$1- password }
Then you use /bouncer with the exact same format as you'd use with /server (/bouncer irc.whatever.net 1234 mypass), but you don't have to enter your password. It will do so for you. If anything else is always the same (such as port), you can adjust it for that...
alias bouncer { server $$1- port password }
With that, you wouldn't ever type the port or the password, as an example.
Note that you can use all of the same /server switches. The only difference without adding a bit more complexity to it is that you can't use the switches that appear after the port/password (-j, -i, etc). And those can be added as well if needed.