C'mon. My Top 10 CS school expected me to put in 60h/week and was pushing me beyond my limits most of the time. My "quant-heavy" MBA required me once to spend 8h/week. If you find MBA difficult, you are probably doing something wrong. Old-school MBA is about networking (basically drinking buddies for life), new trends are about connecting tech people with VCs to use each other to build something new and profitable.

MBA is useful to get overall picture of individual areas from 10,000ft so that you don't need to re-invent everything and have some semi-automated way to process things that are thrown at you while building/managing some organization. You should walk away with knowledge about what financial instruments are at your disposal, how not to completely mess up your organization with one's stupidity or lack of leadership, how to recognize phase of a company you are in etc. This is important when you get under permanent stress while running a company when quality information will be scarce and obfuscated, people's motives will be a mixed bag, and only subjects you mastered and networking circle you built will be with you.