Well they HAVE tamed the course Alfie, but the approach to a lot of the TT course is totally different now to how it used to be. The mental concentration required to be at the present speeds is almost certainly more intense than it was. The rider has to be fitter and stronger to hold on to the power, but the course is certainly smoother, and therefore physically a little easier.
I could tell you a lot about the course changes from the Second World War, but it would take all night!!