I guess, for me, playing straight ahead arranger, not SMF's, mp3's, or just using the drum section, I typically get a lot of joy during the first couple of verses... then the repeated nature of all the variations and fills just starts to bug me.
Maybe it's why we like to medley songs so much? If the backing won't change, at least the song and key can... And fixing the problem by creating custom styles as variations on the one we are using seems altogether too much work! I can create an SMF from the main style, and edit into it plenty of variation in less than half the time it takes to edit styles.
But I am amazed that none of the drum machine manufacturers have not glommed onto the arranger concept... four different patterns, seven fills, intro and ending patterns and a way to control it all hands-free on the fly... Combine that with a good LH bass and you have lots more variety, because you are changing what you play, even if the arranger can't!
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An arranger is just a tool. What matters is what you build with it..!