The 7 line has always been a favorite line of mine, ever since my early childhood days. I can recall the days when the R33WF redbirds once ruled the entire line, to the day the R62A's began replacing them and their eventual domination like if it happened yesterday. Due to the location that i lived in, it was and has been the closest subway line i got in the neighborhood, even during the high school years, and nowadays, the college years. And now i'm about to see the days when the R188 and converted R142A subway cars begin dominating the line and the eventual displacement of the R62A's from that line to the main lines. It's always gotten me to where i needed to go, despite the frequent service changes during the weekends, and the occasional incident that tends to mess up or even suspend the entire line, like the aftermath of Hurricane Sandy which literally forced me to take the Q58 and the Long Island Rail Road's Port Washington Branch to get to manhattan and home until the 7 line was reopened.
Even though i like the J/Z line for their R42 sets that remain, the one major bottleneck and downside are the headways between trains. There's days when i've waited over an hour for a train to show up, especially at nights. Sometimes the skip-stop service makes up for the increased headways, which i like. So it's some sort of a love-hate relationship with the J/Z line, days when i enjoy the line, and days when i despise the line.
