Traffic has gotten so much worse since I first came here in 2011. The good news is that Seattle is small enough that you can walk to most places just fine, and the bus and light rail systems are fantastic.
Also, motorcycles aren't exactly a large block of votes. And, many lane splitting bills include helmet provisions which are a non-starter for some riders.
Source: watched as attempts failed multiple times in Texas.
[1]http://lanesplittingislegal.com/assets/docs/CHP-lane-splitti...