Being the poster and assuming people think I was unhappy that it's happened to me before and I've gotten annoyed with spells, I haven't! I wasn't unhappy that pc's use spells to get around any of my plans, in some cases I set it up so they had to use them. I just made an observation that I've seen it in my own campaign and the campaign I play in with a large group of experienced players where it is also used a lot. Now I'm not saying don't use spells which are designed to help you but I do say don't always rely on them like a great deal of people do, I've seen players become irritated towards a dm due to the fact that they haven't had their own way with a spell. In future dont rely on a spell as they wont always be there!
What would you as players say if it was an extremely low magic campaign where you couldn't use the spells?
Dm's always use the disturbance of rest to stop spell casters regaining spells, and my way was only different in the fact they couldn't cast within 1 mile of the unborn child they were protecting. They were always free to leave the quest as I don't set any adventure in stone. D&D is about choices for the pc's, it's not about rails to sit on. If that was the case go play baldurs gate.
This is the now nice hollow adventure faced by the party and yes it could have been altered but as I stated from the begining of the adventure once the child made it to the safety of the location the undead following them were powerless and would die after a certain period of time or could be defeated earlier a lot easier. So honestly what would you prefer from a dm just turn what was told to the players using a spell for the infomation into a blatent lie and a lot of arguments later on.
Anyway this will be my last post on this subject I think I was right in my adventure, the group had fun the adventure was completed and I got a point across at the same time. I will use incidents like this again as it also falls into another posts argument regarding players armour and not being able to face a threat without it, players are not always fighting at full capabilities as are monsters!