At their best, the P&R churches are not trying to imitate the evangelical services with which you may be familiar. They are trying to be faithful to Scripture as they understand and confess it. They are trying to worship God in the way that he has revealed that he will be worshiped.
Did you stop and get to know those people in the churches? Did you ask them about their burdens? Is it possible there were things much bigger that you were overlooking because of a superficial need for an emotional buzz during worship? [Machenwarrior]
This is a really important consideration for our friends from the broader evangelical world as they come into contact with confessional Presbyterian and Reformed (P&R) worship. There is a high likelihood that those emerging from the broad evangelical traditions are addicted to a regular, even programmed release of dopamine and/or norepinephrine. It is not your fault. You are part of a tradition that dates to the mid-19th century. That tradition (represented and perfected by Charles Finney) discovered ways of manipulating people in public worship in order to move them from point A (the pew) to point B (the anxious bench).
Today many ostensibly evangelical congregations—recent surveys show that it is not at all clear any longer how evangelical, i.e., gospel-centered, they really are—have updated Finney’s methods but they do essentially the same thing: manipulate your emotions with chord progressions.