FE7 as a special place in my heart but a while ago I realized how many chapter I personally considered as "not so fun", right when you get on the dread isle the game becomes annoying:
chapter 18: a FoW map and I'm forced to sacrifice a place of my team for florina so she can get us flora and also the boss character of this chapter is a big difficulty spike.
chapter 19: being racing for chests is kinda annoying to me, and so is the sniper right at the beginning.
chapter 20: another FoW one, and there's a moving boss with a killer axe to make things funnier...
chapter 21: a "survive" chapter, I personally also dislike those ones.
chapter 22: desert chapter
chapter 23: the FoW version though, and sometimes loyd is a moving enemy, the linus version is good though.
chapter 24: another survive one, and this time with annoying enemies on mountains making the enemies dodgier
chapter 25: snow map where you also get slowed down like in the desert chapter
chapter 26: Surprisingly I don't remember having much frustration with this one despite the FoW, protect objective and ursula bolting my mens.
And then after all of those the game's fun again... And yeah long time no see sereneforest!