Depends. It's very practical if you're an independent contractor. I run my contracting from Emacs, including tracking tasks, time, generating invoices and processing documents. The main extra integration I have is LaTeX, which I use to generate nice PDFs to send to customers.
Before, as a salaried employee, I still used it for task management and time tracking - regular software used for that purpose (e.g. Jira) is nowhere near ergonomic enough to make detailed TODO lists, and store notes and code samples along with them. Not to mention, it's not the kind of stuff you'd want to spam on public time/task tracker systems. So Org Mode works really great as a private, more detailed tracking/noting system. Bonus points if you develop with Emacs too, as then you can achieve nice synergy (e.g. evaluating code snippets straight from the notes).
> org mode is a basically similar to other wiki dialects with similar syntax, limitations, tooling, etc. Other than the (emacs) tooling, I don't see a strong reason for preferring it.
That's only partly true. Org's markup language is pretty similar to Markdown. But it's the tooling - the Org Mode - that makes it unique, and mostly unusable outside of Emacs. Within Org language, like TODO markers, priorities, drawers, header options, code block parameters, etc. serve as hooks for the tooling, and this is what lets you turn an .org document from a glorified Markdown into a fully-featured outliner/task tracker/time tracker/spreadsheet/literate programming environment.