I hear it all the time. It is preached often. "Don't fall away from God when times are tough. Remember Him, praise Him, pray!"
Occassionally, I hear or it is preached to not forget God when things are good. Don't fall in complacency, or puff up yourself.
But, neither of those are where I leave God behind. It's in the mediocre, the mundane, the every day.
So long as things are plugging along at a normal pace and life just ticks on by, that's when I find myself saying quick, rote graces. That's when my Bible lays unopened by my bedside. That's when my evening prayers fade into sleep. That's when I don't bother to seek God or spend time in praise and worship.
And since mediocre tends to happen more often than the mountains and valleys in our lives (one would hope), that's a LOT of time I put God on the shelf.
God should be our every day. Christ Jesus should be welcome in our homes, a constant companion by our sides no matter the circumstances.