Worship is a serious matter. It is not generated by programs or liturgy. It comes when an individual approaches God and means business. It should never be flippant or casual in its meaning to the worshiper. That is why we are told to "guard our steps" when we approach God's house.
The key is to come to hear from God. That is contrasted with committing to meaningless ritual with much flair. It is better to be true to simply appoint our hearts to hear from God than to impress anyone with loud music, colorful lights, and fog machines that cause us to miss hearing from God!
It we miss the chance to listen to God, we missed Him. And to do that is called "evil" in this warning. So if we are not attentive, our false worship will do much harm. Hearing from God is a priority in worship.