i could see where it would help JavaScript coding, but you should look more at the big picture...
you are trying to learn programming in .NET not JavaScript.... so you'll either be:
- lessening the learning curve of .NET (and trust me, its a HUGE curve) by using VB.NET since you already know VBScript and/or Visual Basic 6
- increasing the learning curve by using C# since now you are starting from scratch on learning .NET, and yes, you'll learn some JavaScript syntax along the way
JavaScript, from what i have learned, is more or less all about proper Syntax, its really not hard to learn once you get that down (and sites like http://www.w3schools.com just totally rock)