I've seen some really nice UI query systems that have plenty of expressive power for 99.9% of queries but also include an escape hatch to allow you to use a query language. Mixpanel has one that I really like and I've seen non-techy business types go to town on it no problem.

The other option I've seen is a guided query language with helpful UI affordances as you type. I've seen it on Datadog as well as Jira advanced search.