My friend who introduced me to DT lost a bit of interest in them when they released Systematic Chaos. I think it was a combination of him not really digging that direction, and just exploring a lot of different styles of music around that time. He still liked their material before that, but wasn't listening to them as much as he had.
When MP left, he started paying attention again. First because he was worried that it could be the end of the band, but then when MM joined he got really excited about how that could turn out. He absolutely loved ADTOE and DT, and is a huge fan of theirs again, while also listening to all the stuff he had gotten into in the mean time.
I also had several friends who went through a phase where a lot of DT was suddenly too cheesy or silly for them. At that time, they only wanted to listen to 'serious' and 'mature' music (a lot of what they thought of that way back then they now look back on as being really childish, ironically). They didn't want to listen to anything 'uncool'. In the past few years though, a lot of them have come back around, and while they still think that some of DT's music is cheesy, that's a selling point for them these days. That element of music can be really fun.
Interestingly enough, as my musical tastes have broadened drastically over the past few years, the main effect that has had on my DT listening is that I've come to like some of their material that I wasn't all that crazy about in the past.