+1!!!
Sims definitely give you a nice heads up and stuff, but the feeling of reality completely disorientating, you can be calm, cool, and collected in the sim, but IRL will seriously throw you off, you get completely overwhelmed, and can't think straight. There is just something about it that i can't really explain.
But yes, you would be 20x better of with good sim experience then without, and yes it could possibly keep you from dying, but that is a still a small chance.
I had quite a bit of casual sim experience when i started lessons and it is a very different feeling. DCS does that feeling better than any other sim by far, but it is still like 2%.
DCS only really started helping when i followed procedures and flew with precision (at least tried), and even then it was mainly helpful with just the mental aspect, not stick and rudder (although it did make it easier to focus due to lower mental workload).
Also 4-5 hrs seems about right for taxing around and stuff, i have about 4 hrs (all in tailwheel) and i can taxi pretty well but takeoff and landing i still need quite a bit of help with.