To be fair that's an upward angle on a plane taking off, with the flaps fully extended for maximum lift.

This is what a B-52 looks like when in a regular flight configuration.

There is a reason it has the nickname BUFF.

Big Ugly Fat Fuck.

That's because of the era it was designed it. It is from the dawn of the jet age. Jet engines weren't very powerful yet and they believed they had to have very thin and very swept wings to get the speeds they wanted. It was before thrust reversers so it uses drogue chutes. Its wings are too thin to support the weight of the craft so the main landing gear are in the fuselage and the wings droop so much they have the wheels on the wing tips. They were too afraid to have the weight of the plane and payload rotate on take off to the rear wheels so the flaps are so aggressive it actually takes off with a nose down attitude. The front wheels are the last to leave the pavement and the first to touch it. It's just a really strange design because they were still learning about jet design.

It's because the cargo they're built to carry is very dense, hence the very slim fuselage.