I'm late but I'll answer the question.
Visual approaches in 172s, Seminoles, and the ATR were a lot easier because due to the props you could basically make that plane do whatever you wanted it to do.
Visual approaches in jets need planning and energy management. There's really no set profile for them because ATC can clear for a visual from so many angles and everybody adds their own little flavor of technique to it. Some use spoilers to get down, some use flaps. Sometimes you're already on glidepath when they clear you, and sometimes you're sky-high and they clear you (KVPS anyone?)
And the jet due to the speed of the plane there is alot less margin for error. Like Todd said it is really easy to end up super high on final if you really don't know what you're doing. Also really easy to end of super low and cause a terrain warning. Especially at night
For me visual approaches are a numbers game. I just look at the MFD to see how far I am away from the airport I amd times that by 3 to get what altitude I should be at. This is really easy to do if you clean up the approach and stay in white needles and back up it up with the localizer and glideslope in blue. When I'm completely in green I tend to have to have to do a lot more thinking because some places the glideslope and localizer are just jumping all over the place and its really not reliable until you turn final. In some situations if you follow that glideslope before turning final you might end up extremely low.
Now while figuring out on how to get and stay on glide path you also have to consider how you will configure the aircraft. You don't want to hit the 5 mile fix to the runway at 250 knots clean as a whistle with the gear up. I plan for hitting the 5 mile fix at no more than 180 knts and flaps 8. Everything before that is up to your creativity depending on what flight situation you're in.
So to make a long story short, visual approaches in jets are harder because of the lack of a standard profile for them because there are so many different situations you can be in, and so many different ways to get it done, while bleeding off energy. A pilot has to become a master of his aircraft and energy management to create a beautiful approach.