kclark794a: I usually only listen to the Santa Clara city stuff and it can be a handful at times. I usually wind up skipping ahead to the spots which look interesting in order to "catch up". I look for a transmission on their "PD Wide" talkgroup or activity on the higher numbered Fire talkgroups, for instance. Skipping all of the utilities (electric, water/sewer, etc) also helps.
If I was going to listen to other cities, I'd probably only do it after the fact, perhaps by hearing about something out of band (like through a forum, or Twitter, or whatever). But that's just me.
When you say it is "streamed with so many other agencies", do you mean the actual stream provider has a bunch of different channels being scanned conventionally in one audio stream, or something else?