There is drama in Reformed worship: Everyone there are the "actors"--its all dramatic.
"Oh," complains one, "I didn't want to be in the act, just watch it. I wanted to be totally passive."
Really? Well, you can still look at what's happening while you're inovlved. And then there is the biblically ordained visual (and aural, olfactory, sensual, savory) sacramental activity. Baptism. Lord's Supper. That's dramatic.
"Oh, but that's just the same stuff over and over--booooring."
What about visual sermonic illustration?
Prior question: What is preaching? It is an oral proclamation of an official, sovereign decree proclaimed by an accredited messenger. Its all about the Word/words (John 1:1; I Cor. 1:18ff; etc) . The medium and the message are parts of a whole. Nobody's message is more effective if he has "better" visual aids than had Jesus, Paul, Augustin, Calvin, or Spurgeon. The message stays the same. Our efforts to improve it only end up cluttering it.
How are language illustrations superior to visual ones?
1) All those preachers above, and countless others, have used them. They have biblical and historic legitimacy.
2) Non-visual illustrations engage the mind in a way superior to the way visual ones do. Oral illustrations demand more mental input from the recipient. Attentive listening and active imagination engaged together work to get the message deeper down inside us than overt stimulation of the eyes; this truth may be counter-intuitive, but speaking of things spiritual and hence unseen, it must nevertheless be true. We aren't talking about things like building a house, making pottery--practical skills, where doing/seeing it done are integral components of the learning process.
3) The eye-gate has always been one of Satan's most effective channels of attack, temptation, and sin, e.g. Gen. 3:5-6. The fact of idolatry (and "covetousness which is idolatry") is proof of this besetting sin of mankind. God takes the visual and sensual and minimizes them in the worship he prescribes. Idolatry utterly inverts that priority. So any steps we take to increase that element beyond Scripture warrant is one of the most evident violations of the second commandment in the church.