We almost have the same setup then, I use

ssh_hostnames=$(grep "^Host " ~/.ssh/config | awk '!/*/ {print $2}')
for host in $ssh_hostnames
do
 alias $host="ssh $host"
done

in my .bash_aliases to parse the ~/.ssh/config file and cut off the 'ssh ’ part automatically for every Host I have in there.

You can also use ssh shorthands in ~/.ssh/config

With the added benefit of it looking like you’re yelling at your prompt in order to get it to use sudo.