Draw an ASCII meandering curve
Charcoal, 52 34 33 bytes

Ｎθ↶ＦＮＦ⊗⊕θ«+⊖⊗×⊕﹪κ²∨↔⁻θ∧κ⊖κ¹¿›κθ↷↶


Try it online! Link is to verbose version of code. Explanation:

Ｎθ


Input the size of the meander.

↶


Pivot upwards as the drawing starts at the right and works left.

ＦＮ


Loop over the desired number of meanders.

Ｆ⊗⊕θ«


Loop over the segments of the meander.

+


Print a +.

∨↔⁻θ∧κ⊖κ¹


Compute the kth element of the list \$ n, n, n-1, n-2 ... 3, 2, 1, 1, 1, 2, 3, ... n \$.

⊖⊗×⊕﹪κ²...


Alternate between doubling and quadrupling the lengths since the horizontal lines are twice as long, but decrement the result before printing to take account of the + that was just printed.

¿›κθ↷↶


Pivot appropriately for the next segment.