Yes I do. I've had some lawsuits in the USA, some in Europe and the cost of the US lawsuits absolutely dwarfed the ones in Europe.
It's not that $500/hour isn't 'insane' (it actually is, but that goes for the profession as a whole), it's how much time ends up being billed for a case and US lawyers really are experts at running out the clock, and working the system to the point where the legal fees themselves become a weapon in the case (see the excellent examples in this thread illustrating that).
Oh, and to add to this: I also had the distinct feeling that in the US I was often billed at 'partner' rates when the work done was at 'paralegal' level and I always wondered what would happen if you were to audit a large legal office to see if there was more partner time billed than there was partner time to begin with.
It's not that $500/hour isn't 'insane' (it actually is, but that goes for the profession as a whole), it's how much time ends up being billed for a case and US lawyers really are experts at running out the clock, and working the system to the point where the legal fees themselves become a weapon in the case (see the excellent examples in this thread illustrating that).