Redgate SQL Prompt is an add-in for SSMS (and Visual Studio) that provides:

The flagship feature of SQL Prompt is its advanced IntelliSense. As you type, SQL Prompt lists matching objects, keywords, and even snippets.

SQL Prompt adds "Smart" refactoring that isn't available in standard SSMS: Encapsulate as Stored Procedure

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Once installed, these features significantly speed up T-SQL development: Advanced IntelliSense

Some early versions of SSMS 19 (e.g., 19.0 preview) required a beta build of SQL Prompt. As of today, the stable release works flawlessly with SSMS 19.1 and above.