What I meant to say is that when I compared the SVG file with the PNG, the SVG is much smaller than the PNG. Even when I did the CTRL + Scroll button method like you mentioned, the SVG isn't as big or bigger than the PNG.
Because I can export SVGs to PNGs in any size I like (assuming that my computer has enough memory to handle it) by using File -> Export Bitmap. The usual size I use for exported PNGs is 5000px. The actual size of SVGs themselves usually varies, but I try to stay within the limit depicted by the Inkscape's default A4 canvas size.