In theory, it's possible and desirable to process feelings as they come up in activity. Once you acquire the appropriate skills, you will naturally be more present with feelings. The instinctive unconscious repressive mechanism lessens; you are less in the mind, and more in the moment. However, "meditation" for me still represents the optimal conditions for a serious working through of suppressed built-up feelings. You can deeply experience the steps and the consciousness shift each entails. Driving, by the way, can be considered to be a type of meditation, especially on long-distance trips. You are not preoccupied with any pressing activity, the subconscious can jump out, and processing can occur. But still, I feel that sitting quietly with eyes closed is always the best. But how does it feel for you? You should be able to tell when you have resolved a feeling by processing it.