@MitchWagner what do/did you use DT for and what did you expect/hope to get from it? I am not sure if asking us for the most loved DT feature is going to make it clear to you if DT is right for you.
In general; if one has a bunch of “document files” (of all kinds) and want to bring in some organization with the aim to find information quickly, or build a tree of knowledge, or structure a pipeline of information to write a conclusive summary, or … you will need some means to automate/help this process. If it is just a few files, perhaps a file structure is all that is needed. If it is a lot more than a few files, DT can help.
But DT is a swiss army knife, it is many different things to many people. That is good: it brings a level of versatility that is great to fit a variety of problems. That is bad: it may be difficult to figure out how to use it or what to use it “all” for. I have used it in my roles as engineer, marketeer very succesfully and do not know of an alternative system that is as effective as DT for me. I described a bit of this here: DEVONthink 3.0 Public Beta Perhaps that gives you some more ideas what to do with it and how you can figure out what to do with it for your use cases.