I work as a senior developer for one of the largest banks in the US at the moment, and have also worked for a subsidiary of the largest medical provider in the city. Neither of these companies had particularly challenging interviews. Generally, if you are IT, the interviews are simple.

The only people who I have met who turn the interview process into a gamut of algorithm puzzles, are people who happen to be very good at them. These also don't tend to be the people running things at banks, let alone large ones.