This might be very late in the game for a reply. I use it mainly for MOOC and textbook learning as well as very successfully dumping large amounts of German vocabulary into my head.

From February I have the following deck stats (usually 1/2 hour in the morning, whilst stationary cycling - one boring high-intensity body task and one boring high-intensity mental task hack): Mature: 12094
Young+Learn: 392 Unseen: 59142
Suspended: 11528

The decks take a bit of fiddling to ensure you have the correct amount of cards setup. Initially in my first two months, I had too many 'new cards' set up. This would lead to a massive escalation in required time (peaked at 90 minutes in 2 weeks). I then cut new cards, just specified 10-15 new a day, depending on the deck. This evened me out to 30 minutes a day.

One caveat, I don't skip a day, ever. When I go hiking, I pre-learn the 2-3 days that I'll be away from any technology in order to pre-empt coming home to a disheartening deck. There are tablet and phone apps available, but usually when traveling I don't want to wake up to Anki when there is a view. :)

Currently I don't really have a workflow for card addition, although in the past I have mainly used CSV files that were nicely laid out and quality checked before importing. I've also done some BeautifulSoup scraping for website data extraction and word frequencies from books. I also use DuoLingo daily (German again), and the words and useful phrases I typically just dump into org-mode for transfer later (usually once weekly) when I have time.

Initially when creating and managing your decks I would suggest making backups often as sometimes syncing makes weird things happen (mostly media related disappearances between linux desktop client and android tablet) but other than that I love this tool.

For language word lists, I have also created a script that pushes the word or phrase to Google Translate (yes, yes, terms of service fingers in ears) and downloads and saves an MP3 locally. I know AwesomeTTS does most of this, but it is nice to have the media available in countries where internet access is at best intermittent and always capped.

I hope some of this helps. Have fun.