Now that I am older and stiffer after a hard days walking stiles often present me with a problem, the days of just throwing my leg over, followed by the other one is not so easy these days so I tend to make the effort to open gates instead.
Generally, kissing gates are fine, but a few are too enclosed to get through with my rucksack on, I often have to throw my rucksack over, walkthrough and then put it on again.
The ladder types are usually OK, I often just grab upwards, hold on to something secure and pull with my arms and push with my legs, usually no problem at all. The ones with little spring load doors at the top can be tricky sometimes, especially if its a strong spring!
The stiles I hate most are those where the farmer has stretched barbed wire across the top.
The best ones on a warm day are double stiles with about 6' of smooth wooden planking in between, can be ideal for an afternoon sleep.