Sometimes line-endings get messed up by source-control (looking at you Git) and "intellisense" will give you lots of green squigglies that you'd rather not commit to the branch.

A good menu option for SQL Prompt would be 'Normalize Line Endings' with a sub-menu selection of 'Windows' or 'Unix'. Then fire off a regex expression powered search and replace on the file. It's fairly easy to do manually with a Ctrl+Shift+F in Visual Studio, but in SSMS, it's more complicated to do so manually, I think.

Git does this to me once in a while, and I have to open the SQL file in Visual Studio and run through it. Otherwise, a Ctrl+k, Ctrl+Y will reformat the script, but then I lose all customizations that I worked hard to format. That can be a loss of close to one hour on a 1500 line script.