What do you like best?
Like most Adobe products, you have complete control and can customize almost every aspect of the software. It's very easy to customize multiple workspaces, the location of tools and windows, etc. In general, the controls are excellent and I have no complaints because you can literally modify anything to fit your liking. This is in sharp contrast to many of the other office/desktop applications, where multiple clicks are required to do a specific task.
The ability to copy and paste directly from Illustrator is great because you can edit vector shapes/objects right from InDesign.
Finally, I like being able to export files into almost any format. The export to PDF feature didn't always work in earlier releases, but they've since fixed the issue and it works without every crashing or freezing.
What do you dislike?
Since Adobe released the 2018 updates for its CC applications, where users could update to the latest version and keep an older version of the application on their device, InDesign's performance and stability has decayed significantly. If you opt to keep two versions of InDesign and use your saved preferences from the older version, the preferences will be corrupted and cause the program to be unable to save or export files after a period of time. The only workaround so far is to save in a different format, force quit, and restart.
This is very frustrating because it requires due diligence on the users part to periodically quit the application and restart it to avoid the error(s) that I mentioned above. I also do not like how InDesign frequently fails to load your default/custom workspace. Sometimes it will load, but most of the time you have to manually select it otherwise it just defaults to the "Essentials" theme. I suspect this is due to the preferences issue.
One other quirk that can be annoying is the "Edit Image in Photoshop" feature. After selecting this option for an image placed in InDesign, you're taken to Photoshop where you can make changes, etc., but after saving the image in Photoshop I found that it did not automatically update the version in InDesign. This is a cool feature that, in theory, saves time, but I find myself having to locate and re-add the saved image file back into InDesign.
Recommendations to others considering the product
I strongly recommend watching video tutorials before using. There are so many tools right out of the box, and you might not ever use 60% of them, so it helps to know where everything is, how to create basic documents, and then customize the layout based on your specific needs. I found that my productivity and confidence in my InDesign abilities increased after I completely customized the workspace.
What business problems are you solving with the product? What benefits have you realized?
InDesign is my daily driver for creating and designing sales and marketing content. Complete customization and integration with other Adobe CC applications has enabled us to create better content that accurately reflects our company and brand.