Taking 40 years to do an 11 day journey should have raised a few red flags in the Israelites minds. It should have made them say even after the first year "hey, why is this taking so long, what are we doing wrong?" Instead, they complained and grumbled about their circumstances. Instead of going to God and asking why is this happening to us, what are we doing wrong, they chose instead to curse God, to complain against God, they chose to pass the buck and blame someone else for their problems. When you start blaming someone else for your problems, you will remain where you are at and you will never see that problem fixed. Had the Israelites chose to work with God, it probably would not have taken 40 years to do an 11 day journey, but they had the wrong attitude, they had the "woe is me" attitude. Yeah, we see how that really worked out for them. God is always there to help us with our problems, but He will only do so if we will work with Him and stop complaining all the time. It is not wrong to go to God and explain your situation to Him, in fact He wants us to come to Him with out problems and then ask Him for help. After we do this, we need to start praising Him for what He is going to do and we need to stop complaining and grumbling.
Take Away: The next time you have the opportunity to make a choice where you can take the responsibility yourself or pass the buck, choose to take responsibility for your own problems, make a choice to stop having a victim mentality and say, "God, this is my problem, not someone elses, and I ask you now to help me fix this," then start praising Him for the answer.