Nothing gives your sermons that extra something quite like visual aids. They're the only kind of AIDS Christian culture openly embraces. Ha ha haaaaaa but seriously, folks. The pastor really wants to keep your attention. He reckons a visual aid will make his sermon that much more intriguing and applicable.
In non-denominational churches and many Baptist franchises you stand an excellent chance of getting a visual aid with your sermon. Visual aids during sermons will never be found in the mainline denominations or in Episcopal/Catholic churches. Those guys do not follow the evangelical trajectory and wouldn't even consider such cloying gadgetry.
Some common evangelical visual aids are vines (for a vine-and-branches sermon series) and a wall (for any number of biblical references to walls, literal or figurative). Pastors like to walk around and brandish the vines, or stand and sit on the walls. Then there's the prop bed for the have-married-sex-for-30-days sermon. They're making it interactive, y'all.
The sanctuary's screen is a lax version of a visual aid, but it's a visual aid nonetheless. It's mostly used to display the words to non-hymnal worship songs and count down the minutes till the sermon begins, New Year's Eve style. Lately they're being used to illustrate points and display audience-engaging images (engaging the audience being a priority in Christian culture), as well as just flat-out ask for money (see below). No beating around the bush here.
Then again, some energetic pastors forego gadgetry and just try to make their speaking as engaging as possible. Do veins popping out of your neck count as visual aids?