I am an evangelical Christian, and I would like to express my opinion sucintly: I don't believe most of those signs are operating in the church today. There is a lot of debate about what the Bible teaches, and in light of what I have studied I wouldn't completely disregard any of those manifestations on a priori basis. However, what practically 100% of pentecostal or sign and wonders churches regard as manifestations of the Holy Spirit are so far removed from the manifestations we see in the Bible, that I have to regard them as false.
For example, miracles of healings in the Bible were: instantaneous, clearly visible (as were the ailments), undeniable, complete, permanent, open to the public, and didn't require any paraphernalia or big stages to happen.
Supposed healings we see today are: gradual (if they happen at all), not clearly visible (most of the sickness they pretend to cure are invisible such as headaches, back pain, internal tumors), more than questionable (efforts to verify them by a team of experts are usually fruitless), incomplete or temporary, and done in a confined environment that requires lots of chanting, preparation and hysteria before happening.
But God still has the power of healing, it is the gift of healing what is not operating nowadays in the same way it did when Jesus and the apostles exercised their ministries.