Response:

Yes, it is common to make tremendous spiritual progress without dramatic breakthrough experiences. 

A lot of it has to do with your personal style of spiritual growth. 

Some people experience spiritual awakening more gradually and smoothly, for others the same level of growth may present itself as a dramatic breakthrough or “aha” experience. 

Some people learn better through strong contrasts, and others do better with a steady expansion of their awareness. One is more like an off/on light switch, the other a dimmer switch.

Love,

Deepak