If you haven't already got SSMS Tools Pack I highly recommend it.
I use it a lot for the SQL Snippets which allows short cuts for example stf<ENTER> will return Select Top 100 FROM in the query window. All the Snippets are customisable and you create your own.
Running Custom Scripts from the Object Explorer is great too, I have scripts I want to run at a server level so I just click on the Server in Object Explorer and then just choose the script I want to run.
A lot of other really useful tools too, just makes life that little bit easier.