Hi Jed,
I use the bimini when I am tying a small diameter line to a significantly larger line. For example 20# leader to 80# shock tippet. The bimini creates a long section of doubled line that can be used to tie to the thicker line using knots such as a slim beauty, non-name knot, or albright. The other place that I use biminis is on the end of my backing. That way I have a large loop that can be connected to the small loop I have whipped to the back end of my fly line. It is then a breeze to switch from one line to another by just doing a loop to loop connection by passing your reel through the large loop.

Regards,

Keith

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"Time's fun when you're having flies." Kermit the Frog