Large lawns really do require a more powerful engine powered lawn mower. Having more power means that you can have a wider cutting width, saving you time! These mowers also tend to have larger grass collectors, meaning that you spend less time stopping to empty the clippings. A well maintained mower will last a considerable time, although the initial cost may be higher than alternative mowers, the cost evens out over the lifetime of the mower.
Again, self-propelled & electric starting features make these mowers even easier to use than ever before.
If you have a much larger lawn area, you may want to consider looking at a ride on mower.