I spend about 2 hours extra on my sermon setting up my slides the way I want them.
If you have the right visual effects, you can drive home your point.
Yes, saves you from having to pray and depend on the Spirit. Too bad the great pastors of yesterday year weren't able to drive home their point by spending two hours on a powerpoint presentation.
While I am speaking slightly sarcastically, I think Tim's response shows one of the great perils of technology.
INTERJECT: We use it for singing, and on rare occasions for preaching, but I tend not to like it for preaching because it leads to preaching points rather than preaching the text. It is also too confining during a message.
On to the perils: Too many are depending on means other than the Spirit to convict and convince. It shows that, for all our pious talk, our trust in not in the Scripture's power but in the nature of the illustration we tell, the video that we show, the atmosphere we create, the way we put a powerpoint together, etc. Yet none of these things are seen in Scripture as necessary to the preaching. 1 Cor 2 would indicate that many of these things are actually contradictory to "Christ and him crucified." They cloud the message rather than clarify it. If you can't drive home your point through the power of the Spirit through the Word and prayer, the powerpoint won't help.
I think this is a dangerous road.
On to the point: In spite of claims for $10-15,000, most churches can get started for less than $2000. A good projector, a laptop or desktop, and powerpoint or Open Office (which is free) can do the job and is really all you need. Our auditorium seats about 200. We have a $50 laptop, a 3000 lumen projector, and a screen hanging on a wall. We are well under $1500 for it. It wouldn't work in all settings, but it works in most.
Get some help from someone who knows what they are talking about. It depends on your room, the size of your congregation and what you intend to do with it.
Here's my suggestion: Skip the two hours in powerpoint preparation and interact with people, study the text more, and pray. It will be time better spent. A great powerpoint can't rescue a bad message. And a good message doesn't need powerpoint in most cases.