This would make many aspects of rocket design a lot easier, except that Kerbal rocket components tend to be less capable than real ones to compensate. For example, Kerbal fuel tanks have a much higher ratio of dry mass to fuel mass, while Kerbal engines have lower thrust-to-weight ratios. The main net effect is to save the player time.
It takes 2-3 minutes to guide a rocket to orbit, compared to 10-20 minutes for a real one.
Since you'll probably be re-doing your launches over and over until you can figure out what's causing those pesky explosions, it's a welcome respite. Aside from poor structural design and outside influences such as overheating and crashing, parts never fail, and rockets can throttle down to less than 1% and respond instantly-even after spending decades in space. Not a very prominent break, but important in rocket science none-the-less. Scanning planets for Ore is a one-and-done affair - so long as your satellite is in the proper orbit and has enough Electricity in its batteries, the game assumes the surveying attempt will automatically cover the entire planet, which saves you the tedium of having to babysit it while it uncovers slivers of the surface at a time. 
The part of the engine that handles orbital mechanics uses an approximation of real physics called Patched Conics to calculate a craft's trajectory.
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