It can be time consuming... especially if you are new to working on TV's. Think of it as time well spent getting to know your van. Like spending time with a new girlfriend. The more attention and affection you give your van the more it gives back... neglect it and it will soon be gone.
The more time you spend under the hood, the more you will find to do... don't be surprised if that initial list multiplies by a factor of 4 or 5 before you get it all done.
Oh... if you are doing plugs & wires it's a good time to do cap & rotor. Also if you get your PS pump working don't be surprised if some leaks crop up in a few months... you may want to do hoses while your at it. Same re: the thermostat... good time to do rad hoses.
See... even more opportunity to lavish love and affection on your van.
-Jim