Shakti is the most natural and spontaneous part of who we are at our deepest level. Initiation is simply a re-introduction to that natural, fundamental intelligence.
Much has been made of some of the quite phenomenal, almost spectacular symptoms of initiation, however none of these are the reason why initiation is - or should be sought. They are just indicators that the process is underway.
The reason the seeker chooses Shaktipat as his or her path is that it is the safest way of raising kundalini in order to control the minds distractions and allowing it to sink in its source naturally and spontaneously without the initiate needing to do anything to bring this about other than to allow the process to work on its own. The initiate then finds the mind naturally drawn to peace, calm and tranquillity. The initiate is changed from within, without effort.
Shaktipat initiation is more than just experiences. It is a whole new way of life for the initiate. At first, time needs to be set aside for Shakti to be effective, but shortly after one does so Shakti can be felt working in the background day and night, in the waking, dreaming and deep sleep states, not just in hours of practice but continuously in some form or another - no manual path can do this. The more sensitive one becomes to the process, the more obvious the process becomes.