At a minimum, the editors for the Collection query and Aggregate Pipeline stages should support Find and Replace, ideally with regex support. This is helpful in many ways: copying the results of one query to be a $in or $nin for another (but you need to insert commas and quotation marks!), changing "value" to /value/ en masse, or just when you realize you've made an error in multiple places.

Ideally, for Aggregate Pipeline you'd be able to search all the pipeline stages, so if you change "2017" to "2018", you can do it throughout the pipeline.