I work as non software type of engineer my work started using Microsoft Teams when the pandemic kicked in (from what I understand Teams and Slack are roughly equivalent to each other).

I find the organization and layout of Teams quite useful. I'm normally working on multiple projects at a given time so having a different "group" in teams for each of the projects makes a lot of sense for me. Previously I made heavy use of folders in outlook I'd make a new folder in my inbox for each project I was working on. I have email folders (and before folders existed PST files) going back 15 years now.

In order for this to work I'd have to curate my inbox by manually filing each email into the appropriate folder as it arrived, Teams kind of does the equivalent of this by default.

Managing and sharing files between people involved in projects has greatly simplified things previous depending on project we'd use a combination of email (has file size limits for attachments, no built in versioning when people are emailing around multiple revisions of the same powerpoint pres for example), Sharepoint document libraries (really hard to add people to sharepoint groups (maybe it was just way my work was setup but sharepoint security was really draconian, access control basically needed a full time admin to make it workable) and Network shared folders (needs VPN, active directory permissions etc). The way it works now (at least with how my work has it set up) once you are added to a group all the files that have been shared are accessible - having to file tickets to get access to shared folders or get added to groups in sharepoint is a thing of the past.

For long term management of documentation my workplace used to have a physical library with dedicated librarians(I think this dated back to 1960's and 70's). Keep in mind for a lot of technical engineering work etc there are legal requirements to keep information archived (for 50+ years sometimes).

The physical library disappeared in the early 1990's I think (long before my time) all of the physical docs were scanned and digitized we had some ancient MS Dos era software (looked like old early 90's software with a text user interface) I think it was called Q and A or something like that. It functioned as digital index for our at one point physical library. We used this for many years basically everything was archived as a PDF and the index in this DOS software was kept up to date. At some point someone used OCR on all the ancient pdfs which kind of worked and greatly improved searchability of our library.

When I first started we were in process of using some java based web interface to replace this ancient MS Dos software, I can't remember what it was called but I think it was mostly used by Lawyers and people in legal profession, kind of worked for storing technical engineering reports and technical drawings but wasn't really built for that purpose. It's still around people really hate using it. I believe there is a desktop client which might be ok to use but I've only ever accessed it through the web interface which is horrible.

In more recent time we trialed using some software called Confluence but it kind of fizzled out and there has been limited use of Open Source Media Wiki software.