In a post at entitled "Devotions Aren't Magic" Jon Bloom writes,
We know that [devotions aren't magic]...But still, we can be tempted to think that if we just figure out the secret formula—the right mixture of Bible meditation and prayer—we will experience euphoric moments of rapturous communion with the Lord. And if that doesn’t happen, our formula must be wrong.
He then lists five reasons daily devotions are crucial to progress in the Christian life even if our devotional experiences seems rather ordinary.
I encourage you to read the entire post for Jon's explanation of each point.