I just beat Double Dragon last night. I had a hard time with the pillars that show up on level 4.
Yeah this short section is definitely awful. Often I could survive up to level 4 without dying, only to loose everything straight up at the start of this section and get game over.
The section with stalactites falling in level 3 is tricky, but if you run immediately to the right you can avoid them as you're in before they start falling, if I remember well (I could be wrong).
Double Dragon for the arcade doesn't take a lot of quarters to beat, but of course most spend a lot of quarters only to find that out. LOL! Same with Double Dragon on the NES.
It's not the same. On the NES you have 3 lives and zero continues, if you loose 3 lives it's game over and you have to re-start from the begining. In arcade as long as you pay you can continue, so even if you suck hard (I do) you can just insert more credits and the game's never over.