I tried using Wolfram's Workbench ≈20 years ago. (Serious attempts, by the way -- I worked at WRI at the time.) It was too clunky because it is based on Eclipse, hence, I continued using Emacs + Mathematica.
Until October 2025 I used IntelliJ's Wolfram Language plug-in. JetBrains (IntelliJ's makers) changed their policies to Open Source contributors, so, I could not use that plug-in anymore, except, if purchased via JetBrains. I have made such purchase in the past and I was not particularly satisfied. (By the way, purchasing the plug-in completely justified from a financial point of view. I just do not like the occasional "not working" disruptions because of updates and license expirations.)
Hence, I gave Wolfram's Eclipse Workbench (WEW) another try few months ago. WEW is much more agile and useful -- at least on macOS. But somehow I have the same "clunky" experience with it. So, I decided to not use WEW and use instead Wolfram Desktop + Visual Studio Code. (So far, so good.)