I posted this earlier but it got buried: I had the same experience as you and built JQBX[1] to mix it up. It's kind of like Pandora (it's a lot like turntable.fm if you ever used that) but it's user generated so you tend to get more obscure / timely recommendations.
Is there anything close to replacing grooveshark? I loved the coding station, plug.dj that tried to replace that was just some guy playing tons of video game themes
We love JQBX at my office. Much more friendly than our earlier solution to pass around the line in cable between everyone’s computers all day! Great work
[1] https://www.jqbx.fm