It depends. Sometimes it feels like a pain (which coincides with fewer reps to fatigue etc.). Sometimes I get a buzz. Body isn’t in the same “mood” every time. And I space out sessions.
On the flip side, there are great days too. Take advantage of those and get a little more done in the gym. Overall it's about consistency of the practice, not about an individual session being great.
I have to say that physiological randomness of this kind is one of the main "use cases" for structured routines.
Before I lived such a structured life, I also felt like I would enter various activities with a roulette wheel of emotions. Which I found to be a big problem! But these days, and due to my structure, a) my mood is highly stable and predictable and b) on the rare occasions when my mood deviates, I usually have a very good idea of why, e.g. deviations in sleep.