Grouping clips in the timeline is a very powerful but under-used feature within Premiere Pro. Part of the reason it's under-used is because once you group some clips together, there's no visual indicator in the timeline that those clips have been grouped. 

Feature Request: Add some type of visual indication of clips that have been grouped together in the timeline. The clip label color should remain as well as all other readable metadata, but by giving the clips a visual indicator that they are grouped, you can quickly glance the timeline and see which clips you want to stay together. This can be useful for sound bites that have been drastically edited but need to stay together. This could be useful for any of you clips in B-roll that you want to easily move and stay together. And this would be different from nesting because when you nest a clip, you can't see what's inside the nest, which is often vital when editing. 

If you don't know about group clips, then check out this tip:

Tool Tip Tuesday for Adobe Premiere Pro: Group and Ungroup Clips in the Timeline