Welcome! I came here from Reddit myself.

The biggest difference is probably that instead of following communities (subreddits) we follow individuals. The hard part is finding the ones worth following.

A few I've found so far that post mostly quality content:
https://steemit.com/@donkeypong - history, sports, general musings
https://steemit.com/@rerez - video games
https://steemit.com/@hanshotfirst - film
https://steemit.com/@pandorasbox - cryptocurrencies