There are wide variations between the different Christian denominations/groups in terms of spiritual experiences. This includes their occurrence at all and how commonly they occur. Roman Catholics, more vanilla flavored groups (Baptists&Lutherans?), and the charismatic and pentecostal groups have massive variations on this that I've witnessed first hand.

I'm confident that there are Christian groups who have zero or next to zero spiritual experiences ever while there are also groups like the charismatic church within 5 km of my house where everyone in the entire church exhibits glossolalia and believes they are being gifted special fruits/powers via direct spirit possession by the holy spirit/ghost every single Sunday. That church has at least 300 members and is not an uncommon denomination in my area either. (And yes, watching a massive room full of >300 people stand around convulsing and making weird nonsense noises while they believe they're being taken over by a non-human entity is about as disturbing as it sounds.)

The fact that people have stronger spiritual experiences at summer camps doesn't surprise me based on what I've seen. The stuff that happened at a related church's summer camp that I witnessed was even stranger and more discomforting that what I wrote above.